/*!
 * Chart.js v3.9.1
 * https://www.chartjs.org
 * (c) 2022 Chart.js Contributors
 * Released under the MIT License
 */
(function (global, factory) {
    typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
        typeof define === 'function' && define.amd ? define(factory) :
            (global = typeof globalThis !== 'undefined' ? globalThis : global || self, global.Chart = factory());
})(this, (function () { 'use strict';

    function noop() {}
    const uid = (function() {
        let id = 0;
        return function() {
            return id++;
        };
    }());
    function isNullOrUndef(value) {
        return value === null || typeof value === 'undefined';
    }
    function isArray(value) {
        if (Array.isArray && Array.isArray(value)) {
            return true;
        }
        const type = Object.prototype.toString.call(value);
        if (type.slice(0, 7) === '[object' && type.slice(-6) === 'Array]') {
            return true;
        }
        return false;
    }
    function isObject(value) {
        return value !== null && Object.prototype.toString.call(value) === '[object Object]';
    }
    const isNumberFinite = (value) => (typeof value === 'number' || value instanceof Number) && isFinite(+value);
    function finiteOrDefault(value, defaultValue) {
        return isNumberFinite(value) ? value : defaultValue;
    }
    function valueOrDefault(value, defaultValue) {
        return typeof value === 'undefined' ? defaultValue : value;
    }
    const toPercentage = (value, dimension) =>
        typeof value === 'string' && value.endsWith('%') ?
            parseFloat(value) / 100
            : value / dimension;
    const toDimension = (value, dimension) =>
        typeof value === 'string' && value.endsWith('%') ?
            parseFloat(value) / 100 * dimension
            : +value;
    function callback(fn, args, thisArg) {
        if (fn && typeof fn.call === 'function') {
            return fn.apply(thisArg, args);
        }
    }
    function each(loopable, fn, thisArg, reverse) {
        let i, len, keys;
        if (isArray(loopable)) {
            len = loopable.length;
            if (reverse) {
                for (i = len - 1; i >= 0; i--) {
                    fn.call(thisArg, loopable[i], i);
                }
            } else {
                for (i = 0; i < len; i++) {
                    fn.call(thisArg, loopable[i], i);
                }
            }
        } else if (isObject(loopable)) {
            keys = Object.keys(loopable);
            len = keys.length;
            for (i = 0; i < len; i++) {
                fn.call(thisArg, loopable[keys[i]], keys[i]);
            }
        }
    }
    function _elementsEqual(a0, a1) {
        let i, ilen, v0, v1;
        if (!a0 || !a1 || a0.length !== a1.length) {
            return false;
        }
        for (i = 0, ilen = a0.length; i < ilen; ++i) {
            v0 = a0[i];
            v1 = a1[i];
            if (v0.datasetIndex !== v1.datasetIndex || v0.index !== v1.index) {
                return false;
            }
        }
        return true;
    }
    function clone$1(source) {
        if (isArray(source)) {
            return source.map(clone$1);
        }
        if (isObject(source)) {
            const target = Object.create(null);
            const keys = Object.keys(source);
            const klen = keys.length;
            let k = 0;
            for (; k < klen; ++k) {
                target[keys[k]] = clone$1(source[keys[k]]);
            }
            return target;
        }
        return source;
    }
    function isValidKey(key) {
        return ['__proto__', 'prototype', 'constructor'].indexOf(key) === -1;
    }
    function _merger(key, target, source, options) {
        if (!isValidKey(key)) {
            return;
        }
        const tval = target[key];
        const sval = source[key];
        if (isObject(tval) && isObject(sval)) {
            merge(tval, sval, options);
        } else {
            target[key] = clone$1(sval);
        }
    }
    function merge(target, source, options) {
        const sources = isArray(source) ? source : [source];
        const ilen = sources.length;
        if (!isObject(target)) {
            return target;
        }
        options = options || {};
        const merger = options.merger || _merger;
        for (let i = 0; i < ilen; ++i) {
            source = sources[i];
            if (!isObject(source)) {
                continue;
            }
            const keys = Object.keys(source);
            for (let k = 0, klen = keys.length; k < klen; ++k) {
                merger(keys[k], target, source, options);
            }
        }
        return target;
    }
    function mergeIf(target, source) {
        return merge(target, source, {merger: _mergerIf});
    }
    function _mergerIf(key, target, source) {
        if (!isValidKey(key)) {
            return;
        }
        const tval = target[key];
        const sval = source[key];
        if (isObject(tval) && isObject(sval)) {
            mergeIf(tval, sval);
        } else if (!Object.prototype.hasOwnProperty.call(target, key)) {
            target[key] = clone$1(sval);
        }
    }
    function _deprecated(scope, value, previous, current) {
        if (value !== undefined) {
            console.warn(scope + ': "' + previous +
                '" is deprecated. Please use "' + current + '" instead');
        }
    }
    const keyResolvers = {
        '': v => v,
        x: o => o.x,
        y: o => o.y
    };
    function resolveObjectKey(obj, key) {
        const resolver = keyResolvers[key] || (keyResolvers[key] = _getKeyResolver(key));
        return resolver(obj);
    }
    function _getKeyResolver(key) {
        const keys = _splitKey(key);
        return obj => {
            for (const k of keys) {
                if (k === '') {
                    break;
                }
                obj = obj && obj[k];
            }
            return obj;
        };
    }
    function _splitKey(key) {
        const parts = key.split('.');
        const keys = [];
        let tmp = '';
        for (const part of parts) {
            tmp += part;
            if (tmp.endsWith('\\')) {
                tmp = tmp.slice(0, -1) + '.';
            } else {
                keys.push(tmp);
                tmp = '';
            }
        }
        return keys;
    }
    function _capitalize(str) {
        return str.charAt(0).toUpperCase() + str.slice(1);
    }
    const defined = (value) => typeof value !== 'undefined';
    const isFunction = (value) => typeof value === 'function';
    const setsEqual = (a, b) => {
        if (a.size !== b.size) {
            return false;
        }
        for (const item of a) {
            if (!b.has(item)) {
                return false;
            }
        }
        return true;
    };
    function _isClickEvent(e) {
        return e.type === 'mouseup' || e.type === 'click' || e.type === 'contextmenu';
    }

    const PI = Math.PI;
    const TAU = 2 * PI;
    const PITAU = TAU + PI;
    const INFINITY = Number.POSITIVE_INFINITY;
    const RAD_PER_DEG = PI / 180;
    const HALF_PI = PI / 2;
    const QUARTER_PI = PI / 4;
    const TWO_THIRDS_PI = PI * 2 / 3;
    const log10 = Math.log10;
    const sign = Math.sign;
    function niceNum(range) {
        const roundedRange = Math.round(range);
        range = almostEquals(range, roundedRange, range / 1000) ? roundedRange : range;
        const niceRange = Math.pow(10, Math.floor(log10(range)));
        const fraction = range / niceRange;
        const niceFraction = fraction <= 1 ? 1 : fraction <= 2 ? 2 : fraction <= 5 ? 5 : 10;
        return niceFraction * niceRange;
    }
    function _factorize(value) {
        const result = [];
        const sqrt = Math.sqrt(value);
        let i;
        for (i = 1; i < sqrt; i++) {
            if (value % i === 0) {
                result.push(i);
                result.push(value / i);
            }
        }
        if (sqrt === (sqrt | 0)) {
            result.push(sqrt);
        }
        result.sort((a, b) => a - b).pop();
        return result;
    }
    function isNumber(n) {
        return !isNaN(parseFloat(n)) && isFinite(n);
    }
    function almostEquals(x, y, epsilon) {
        return Math.abs(x - y) < epsilon;
    }
    function almostWhole(x, epsilon) {
        const rounded = Math.round(x);
        return ((rounded - epsilon) <= x) && ((rounded + epsilon) >= x);
    }
    function _setMinAndMaxByKey(array, target, property) {
        let i, ilen, value;
        for (i = 0, ilen = array.length; i < ilen; i++) {
            value = array[i][property];
            if (!isNaN(value)) {
                target.min = Math.min(target.min, value);
                target.max = Math.max(target.max, value);
            }
        }
    }
    function toRadians(degrees) {
        return degrees * (PI / 180);
    }
    function toDegrees(radians) {
        return radians * (180 / PI);
    }
    function _decimalPlaces(x) {
        if (!isNumberFinite(x)) {
            return;
        }
        let e = 1;
        let p = 0;
        while (Math.round(x * e) / e !== x) {
            e *= 10;
            p++;
        }
        return p;
    }
    function getAngleFromPoint(centrePoint, anglePoint) {
        const distanceFromXCenter = anglePoint.x - centrePoint.x;
        const distanceFromYCenter = anglePoint.y - centrePoint.y;
        const radialDistanceFromCenter = Math.sqrt(distanceFromXCenter * distanceFromXCenter + distanceFromYCenter * distanceFromYCenter);
        let angle = Math.atan2(distanceFromYCenter, distanceFromXCenter);
        if (angle < (-0.5 * PI)) {
            angle += TAU;
        }
        return {
            angle,
            distance: radialDistanceFromCenter
        };
    }
    function distanceBetweenPoints(pt1, pt2) {
        return Math.sqrt(Math.pow(pt2.x - pt1.x, 2) + Math.pow(pt2.y - pt1.y, 2));
    }
    function _angleDiff(a, b) {
        return (a - b + PITAU) % TAU - PI;
    }
    function _normalizeAngle(a) {
        return (a % TAU + TAU) % TAU;
    }
    function _angleBetween(angle, start, end, sameAngleIsFullCircle) {
        const a = _normalizeAngle(angle);
        const s = _normalizeAngle(start);
        const e = _normalizeAngle(end);
        const angleToStart = _normalizeAngle(s - a);
        const angleToEnd = _normalizeAngle(e - a);
        const startToAngle = _normalizeAngle(a - s);
        const endToAngle = _normalizeAngle(a - e);
        return a === s || a === e || (sameAngleIsFullCircle && s === e)
            || (angleToStart > angleToEnd && startToAngle < endToAngle);
    }
    function _limitValue(value, min, max) {
        return Math.max(min, Math.min(max, value));
    }
    function _int16Range(value) {
        return _limitValue(value, -32768, 32767);
    }
    function _isBetween(value, start, end, epsilon = 1e-6) {
        return value >= Math.min(start, end) - epsilon && value <= Math.max(start, end) + epsilon;
    }

    function _lookup(table, value, cmp) {
        cmp = cmp || ((index) => table[index] < value);
        let hi = table.length - 1;
        let lo = 0;
        let mid;
        while (hi - lo > 1) {
            mid = (lo + hi) >> 1;
            if (cmp(mid)) {
                lo = mid;
            } else {
                hi = mid;
            }
        }
        return {lo, hi};
    }
    const _lookupByKey = (table, key, value, last) =>
        _lookup(table, value, last
            ? index => table[index][key] <= value
            : index => table[index][key] < value);
    const _rlookupByKey = (table, key, value) =>
        _lookup(table, value, index => table[index][key] >= value);
    function _filterBetween(values, min, max) {
        let start = 0;
        let end = values.length;
        while (start < end && values[start] < min) {
            start++;
        }
        while (end > start && values[end - 1] > max) {
            end--;
        }
        return start > 0 || end < values.length
            ? values.slice(start, end)
            : values;
    }
    const arrayEvents = ['push', 'pop', 'shift', 'splice', 'unshift'];
    function listenArrayEvents(array, listener) {
        if (array._chartjs) {
            array._chartjs.listeners.push(listener);
            return;
        }
        Object.defineProperty(array, '_chartjs', {
            configurable: true,
            enumerable: false,
            value: {
                listeners: [listener]
            }
        });
        arrayEvents.forEach((key) => {
            const method = '_onData' + _capitalize(key);
            const base = array[key];
            Object.defineProperty(array, key, {
                configurable: true,
                enumerable: false,
                value(...args) {
                    const res = base.apply(this, args);
                    array._chartjs.listeners.forEach((object) => {
                        if (typeof object[method] === 'function') {
                            object[method](...args);
                        }
                    });
                    return res;
                }
            });
        });
    }
    function unlistenArrayEvents(array, listener) {
        const stub = array._chartjs;
        if (!stub) {
            return;
        }
        const listeners = stub.listeners;
        const index = listeners.indexOf(listener);
        if (index !== -1) {
            listeners.splice(index, 1);
        }
        if (listeners.length > 0) {
            return;
        }
        arrayEvents.forEach((key) => {
            delete array[key];
        });
        delete array._chartjs;
    }
    function _arrayUnique(items) {
        const set = new Set();
        let i, ilen;
        for (i = 0, ilen = items.length; i < ilen; ++i) {
            set.add(items[i]);
        }
        if (set.size === ilen) {
            return items;
        }
        return Array.from(set);
    }

    function fontString(pixelSize, fontStyle, fontFamily) {
        return fontStyle + ' ' + pixelSize + 'px ' + fontFamily;
    }
    const requestAnimFrame = (function() {
        if (typeof window === 'undefined') {
            return function(callback) {
                return callback();
            };
        }
        return window.requestAnimationFrame;
    }());
    function throttled(fn, thisArg, updateFn) {
        const updateArgs = updateFn || ((args) => Array.prototype.slice.call(args));
        let ticking = false;
        let args = [];
        return function(...rest) {
            args = updateArgs(rest);
            if (!ticking) {
                ticking = true;
                requestAnimFrame.call(window, () => {
                    ticking = false;
                    fn.apply(thisArg, args);
                });
            }
        };
    }
    function debounce(fn, delay) {
        let timeout;
        return function(...args) {
            if (delay) {
                clearTimeout(timeout);
                timeout = setTimeout(fn, delay, args);
            } else {
                fn.apply(this, args);
            }
            return delay;
        };
    }
    const _toLeftRightCenter = (align) => align === 'start' ? 'left' : align === 'end' ? 'right' : 'center';
    const _alignStartEnd = (align, start, end) => align === 'start' ? start : align === 'end' ? end : (start + end) / 2;
    const _textX = (align, left, right, rtl) => {
        const check = rtl ? 'left' : 'right';
        return align === check ? right : align === 'center' ? (left + right) / 2 : left;
    };
    function _getStartAndCountOfVisiblePoints(meta, points, animationsDisabled) {
        const pointCount = points.length;
        let start = 0;
        let count = pointCount;
        if (meta._sorted) {
            const {iScale, _parsed} = meta;
            const axis = iScale.axis;
            const {min, max, minDefined, maxDefined} = iScale.getUserBounds();
            if (minDefined) {
                start = _limitValue(Math.min(
                        _lookupByKey(_parsed, iScale.axis, min).lo,
                        animationsDisabled ? pointCount : _lookupByKey(points, axis, iScale.getPixelForValue(min)).lo),
                    0, pointCount - 1);
            }
            if (maxDefined) {
                count = _limitValue(Math.max(
                        _lookupByKey(_parsed, iScale.axis, max, true).hi + 1,
                        animationsDisabled ? 0 : _lookupByKey(points, axis, iScale.getPixelForValue(max), true).hi + 1),
                    start, pointCount) - start;
            } else {
                count = pointCount - start;
            }
        }
        return {start, count};
    }
    function _scaleRangesChanged(meta) {
        const {xScale, yScale, _scaleRanges} = meta;
        const newRanges = {
            xmin: xScale.min,
            xmax: xScale.max,
            ymin: yScale.min,
            ymax: yScale.max
        };
        if (!_scaleRanges) {
            meta._scaleRanges = newRanges;
            return true;
        }
        const changed = _scaleRanges.xmin !== xScale.min
            || _scaleRanges.xmax !== xScale.max
            || _scaleRanges.ymin !== yScale.min
            || _scaleRanges.ymax !== yScale.max;
        Object.assign(_scaleRanges, newRanges);
        return changed;
    }

    class Animator {
        constructor() {
            this._request = null;
            this._charts = new Map();
            this._running = false;
            this._lastDate = undefined;
        }
        _notify(chart, anims, date, type) {
            const callbacks = anims.listeners[type];
            const numSteps = anims.duration;
            callbacks.forEach(fn => fn({
                chart,
                initial: anims.initial,
                numSteps,
                currentStep: Math.min(date - anims.start, numSteps)
            }));
        }
        _refresh() {
            if (this._request) {
                return;
            }
            this._running = true;
            this._request = requestAnimFrame.call(window, () => {
                this._update();
                this._request = null;
                if (this._running) {
                    this._refresh();
                }
            });
        }
        _update(date = Date.now()) {
            let remaining = 0;
            this._charts.forEach((anims, chart) => {
                if (!anims.running || !anims.items.length) {
                    return;
                }
                const items = anims.items;
                let i = items.length - 1;
                let draw = false;
                let item;
                for (; i >= 0; --i) {
                    item = items[i];
                    if (item._active) {
                        if (item._total > anims.duration) {
                            anims.duration = item._total;
                        }
                        item.tick(date);
                        draw = true;
                    } else {
                        items[i] = items[items.length - 1];
                        items.pop();
                    }
                }
                if (draw) {
                    chart.draw();
                    this._notify(chart, anims, date, 'progress');
                }
                if (!items.length) {
                    anims.running = false;
                    this._notify(chart, anims, date, 'complete');
                    anims.initial = false;
                }
                remaining += items.length;
            });
            this._lastDate = date;
            if (remaining === 0) {
                this._running = false;
            }
        }
        _getAnims(chart) {
            const charts = this._charts;
            let anims = charts.get(chart);
            if (!anims) {
                anims = {
                    running: false,
                    initial: true,
                    items: [],
                    listeners: {
                        complete: [],
                        progress: []
                    }
                };
                charts.set(chart, anims);
            }
            return anims;
        }
        listen(chart, event, cb) {
            this._getAnims(chart).listeners[event].push(cb);
        }
        add(chart, items) {
            if (!items || !items.length) {
                return;
            }
            this._getAnims(chart).items.push(...items);
        }
        has(chart) {
            return this._getAnims(chart).items.length > 0;
        }
        start(chart) {
            const anims = this._charts.get(chart);
            if (!anims) {
                return;
            }
            anims.running = true;
            anims.start = Date.now();
            anims.duration = anims.items.reduce((acc, cur) => Math.max(acc, cur._duration), 0);
            this._refresh();
        }
        running(chart) {
            if (!this._running) {
                return false;
            }
            const anims = this._charts.get(chart);
            if (!anims || !anims.running || !anims.items.length) {
                return false;
            }
            return true;
        }
        stop(chart) {
            const anims = this._charts.get(chart);
            if (!anims || !anims.items.length) {
                return;
            }
            const items = anims.items;
            let i = items.length - 1;
            for (; i >= 0; --i) {
                items[i].cancel();
            }
            anims.items = [];
            this._notify(chart, anims, Date.now(), 'complete');
        }
        remove(chart) {
            return this._charts.delete(chart);
        }
    }
    var animator = new Animator();

    /*!
 * @kurkle/color v0.2.1
 * https://github.com/kurkle/color#readme
 * (c) 2022 Jukka Kurkela
 * Released under the MIT License
 */
    function round(v) {
        return v + 0.5 | 0;
    }
    const lim = (v, l, h) => Math.max(Math.min(v, h), l);
    function p2b(v) {
        return lim(round(v * 2.55), 0, 255);
    }
    function n2b(v) {
        return lim(round(v * 255), 0, 255);
    }
    function b2n(v) {
        return lim(round(v / 2.55) / 100, 0, 1);
    }
    function n2p(v) {
        return lim(round(v * 100), 0, 100);
    }
    const map$1 = {0: 0, 1: 1, 2: 2, 3: 3, 4: 4, 5: 5, 6: 6, 7: 7, 8: 8, 9: 9, A: 10, B: 11, C: 12, D: 13, E: 14, F: 15, a: 10, b: 11, c: 12, d: 13, e: 14, f: 15};
    const hex = [...'0123456789ABCDEF'];
    const h1 = b => hex[b & 0xF];
    const h2 = b => hex[(b & 0xF0) >> 4] + hex[b & 0xF];
    const eq = b => ((b & 0xF0) >> 4) === (b & 0xF);
    const isShort = v => eq(v.r) && eq(v.g) && eq(v.b) && eq(v.a);
    function hexParse(str) {
        var len = str.length;
        var ret;
        if (str[0] === '#') {
            if (len === 4 || len === 5) {
                ret = {
                    r: 255 & map$1[str[1]] * 17,
                    g: 255 & map$1[str[2]] * 17,
                    b: 255 & map$1[str[3]] * 17,
                    a: len === 5 ? map$1[str[4]] * 17 : 255
                };
            } else if (len === 7 || len === 9) {
                ret = {
                    r: map$1[str[1]] << 4 | map$1[str[2]],
                    g: map$1[str[3]] << 4 | map$1[str[4]],
                    b: map$1[str[5]] << 4 | map$1[str[6]],
                    a: len === 9 ? (map$1[str[7]] << 4 | map$1[str[8]]) : 255
                };
            }
        }
        return ret;
    }
    const alpha = (a, f) => a < 255 ? f(a) : '';
    function hexString(v) {
        var f = isShort(v) ? h1 : h2;
        return v
            ? '#' + f(v.r) + f(v.g) + f(v.b) + alpha(v.a, f)
            : undefined;
    }
    const HUE_RE = /^(hsla?|hwb|hsv)\(\s*([-+.e\d]+)(?:deg)?[\s,]+([-+.e\d]+)%[\s,]+([-+.e\d]+)%(?:[\s,]+([-+.e\d]+)(%)?)?\s*\)$/;
    function hsl2rgbn(h, s, l) {
        const a = s * Math.min(l, 1 - l);
        const f = (n, k = (n + h / 30) % 12) => l - a * Math.max(Math.min(k - 3, 9 - k, 1), -1);
        return [f(0), f(8), f(4)];
    }
    function hsv2rgbn(h, s, v) {
        const f = (n, k = (n + h / 60) % 6) => v - v * s * Math.max(Math.min(k, 4 - k, 1), 0);
        return [f(5), f(3), f(1)];
    }
    function hwb2rgbn(h, w, b) {
        const rgb = hsl2rgbn(h, 1, 0.5);
        let i;
        if (w + b > 1) {
            i = 1 / (w + b);
            w *= i;
            b *= i;
        }
        for (i = 0; i < 3; i++) {
            rgb[i] *= 1 - w - b;
            rgb[i] += w;
        }
        return rgb;
    }
    function hueValue(r, g, b, d, max) {
        if (r === max) {
            return ((g - b) / d) + (g < b ? 6 : 0);
        }
        if (g === max) {
            return (b - r) / d + 2;
        }
        return (r - g) / d + 4;
    }
    function rgb2hsl(v) {
        const range = 255;
        const r = v.r / range;
        const g = v.g / range;
        const b = v.b / range;
        const max = Math.max(r, g, b);
        const min = Math.min(r, g, b);
        const l = (max + min) / 2;
        let h, s, d;
        if (max !== min) {
            d = max - min;
            s = l > 0.5 ? d / (2 - max - min) : d / (max + min);
            h = hueValue(r, g, b, d, max);
            h = h * 60 + 0.5;
        }
        return [h | 0, s || 0, l];
    }
    function calln(f, a, b, c) {
        return (
            Array.isArray(a)
                ? f(a[0], a[1], a[2])
                : f(a, b, c)
        ).map(n2b);
    }
    function hsl2rgb(h, s, l) {
        return calln(hsl2rgbn, h, s, l);
    }
    function hwb2rgb(h, w, b) {
        return calln(hwb2rgbn, h, w, b);
    }
    function hsv2rgb(h, s, v) {
        return calln(hsv2rgbn, h, s, v);
    }
    function hue(h) {
        return (h % 360 + 360) % 360;
    }
    function hueParse(str) {
        const m = HUE_RE.exec(str);
        let a = 255;
        let v;
        if (!m) {
            return;
        }
        if (m[5] !== v) {
            a = m[6] ? p2b(+m[5]) : n2b(+m[5]);
        }
        const h = hue(+m[2]);
        const p1 = +m[3] / 100;
        const p2 = +m[4] / 100;
        if (m[1] === 'hwb') {
            v = hwb2rgb(h, p1, p2);
        } else if (m[1] === 'hsv') {
            v = hsv2rgb(h, p1, p2);
        } else {
            v = hsl2rgb(h, p1, p2);
        }
        return {
            r: v[0],
            g: v[1],
            b: v[2],
            a: a
        };
    }
    function rotate(v, deg) {
        var h = rgb2hsl(v);
        h[0] = hue(h[0] + deg);
        h = hsl2rgb(h);
        v.r = h[0];
        v.g = h[1];
        v.b = h[2];
    }
    function hslString(v) {
        if (!v) {
            return;
        }
        const a = rgb2hsl(v);
        const h = a[0];
        const s = n2p(a[1]);
        const l = n2p(a[2]);
        return v.a < 255
            ? `hsla(${h}, ${s}%, ${l}%, ${b2n(v.a)})`
            : `hsl(${h}, ${s}%, ${l}%)`;
    }
    const map$2 = {
        x: 'dark',
        Z: 'light',
        Y: 're',
        X: 'blu',
        W: 'gr',
        V: 'medium',
        U: 'slate',
        A: 'ee',
        T: 'ol',
        S: 'or',
        B: 'ra',
        C: 'lateg',
        D: 'ights',
        R: 'in',
        Q: 'turquois',
        E: 'hi',
        P: 'ro',
        O: 'al',
        N: 'le',
        M: 'de',
        L: 'yello',
        F: 'en',
        K: 'ch',
        G: 'arks',
        H: 'ea',
        I: 'ightg',
        J: 'wh'
    };
    const names$1 = {
        OiceXe: 'f0f8ff',
        antiquewEte: 'faebd7',
        aqua: 'ffff',
        aquamarRe: '7fffd4',
        azuY: 'f0ffff',
        beige: 'f5f5dc',
        bisque: 'ffe4c4',
        black: '0',
        blanKedOmond: 'ffebcd',
        Xe: 'ff',
        XeviTet: '8a2be2',
        bPwn: 'a52a2a',
        burlywood: 'deb887',
        caMtXe: '5f9ea0',
        KartYuse: '7fff00',
        KocTate: 'd2691e',
        cSO: 'ff7f50',
        cSnflowerXe: '6495ed',
        cSnsilk: 'fff8dc',
        crimson: 'dc143c',
        cyan: 'ffff',
        xXe: '8b',
        xcyan: '8b8b',
        xgTMnPd: 'b8860b',
        xWay: 'a9a9a9',
        xgYF: '6400',
        xgYy: 'a9a9a9',
        xkhaki: 'bdb76b',
        xmagFta: '8b008b',
        xTivegYF: '556b2f',
        xSange: 'ff8c00',
        xScEd: '9932cc',
        xYd: '8b0000',
        xsOmon: 'e9967a',
        xsHgYF: '8fbc8f',
        xUXe: '483d8b',
        xUWay: '2f4f4f',
        xUgYy: '2f4f4f',
        xQe: 'ced1',
        xviTet: '9400d3',
        dAppRk: 'ff1493',
        dApskyXe: 'bfff',
        dimWay: '696969',
        dimgYy: '696969',
        dodgerXe: '1e90ff',
        fiYbrick: 'b22222',
        flSOwEte: 'fffaf0',
        foYstWAn: '228b22',
        fuKsia: 'ff00ff',
        gaRsbSo: 'dcdcdc',
        ghostwEte: 'f8f8ff',
        gTd: 'ffd700',
        gTMnPd: 'daa520',
        Way: '808080',
        gYF: '8000',
        gYFLw: 'adff2f',
        gYy: '808080',
        honeyMw: 'f0fff0',
        hotpRk: 'ff69b4',
        RdianYd: 'cd5c5c',
        Rdigo: '4b0082',
        ivSy: 'fffff0',
        khaki: 'f0e68c',
        lavFMr: 'e6e6fa',
        lavFMrXsh: 'fff0f5',
        lawngYF: '7cfc00',
        NmoncEffon: 'fffacd',
        ZXe: 'add8e6',
        ZcSO: 'f08080',
        Zcyan: 'e0ffff',
        ZgTMnPdLw: 'fafad2',
        ZWay: 'd3d3d3',
        ZgYF: '90ee90',
        ZgYy: 'd3d3d3',
        ZpRk: 'ffb6c1',
        ZsOmon: 'ffa07a',
        ZsHgYF: '20b2aa',
        ZskyXe: '87cefa',
        ZUWay: '778899',
        ZUgYy: '778899',
        ZstAlXe: 'b0c4de',
        ZLw: 'ffffe0',
        lime: 'ff00',
        limegYF: '32cd32',
        lRF: 'faf0e6',
        magFta: 'ff00ff',
        maPon: '800000',
        VaquamarRe: '66cdaa',
        VXe: 'cd',
        VScEd: 'ba55d3',
        VpurpN: '9370db',
        VsHgYF: '3cb371',
        VUXe: '7b68ee',
        VsprRggYF: 'fa9a',
        VQe: '48d1cc',
        VviTetYd: 'c71585',
        midnightXe: '191970',
        mRtcYam: 'f5fffa',
        mistyPse: 'ffe4e1',
        moccasR: 'ffe4b5',
        navajowEte: 'ffdead',
        navy: '80',
        Tdlace: 'fdf5e6',
        Tive: '808000',
        TivedBb: '6b8e23',
        Sange: 'ffa500',
        SangeYd: 'ff4500',
        ScEd: 'da70d6',
        pOegTMnPd: 'eee8aa',
        pOegYF: '98fb98',
        pOeQe: 'afeeee',
        pOeviTetYd: 'db7093',
        papayawEp: 'ffefd5',
        pHKpuff: 'ffdab9',
        peru: 'cd853f',
        pRk: 'ffc0cb',
        plum: 'dda0dd',
        powMrXe: 'b0e0e6',
        purpN: '800080',
        YbeccapurpN: '663399',
        Yd: 'ff0000',
        Psybrown: 'bc8f8f',
        PyOXe: '4169e1',
        saddNbPwn: '8b4513',
        sOmon: 'fa8072',
        sandybPwn: 'f4a460',
        sHgYF: '2e8b57',
        sHshell: 'fff5ee',
        siFna: 'a0522d',
        silver: 'c0c0c0',
        skyXe: '87ceeb',
        UXe: '6a5acd',
        UWay: '708090',
        UgYy: '708090',
        snow: 'fffafa',
        sprRggYF: 'ff7f',
        stAlXe: '4682b4',
        tan: 'd2b48c',
        teO: '8080',
        tEstN: 'd8bfd8',
        tomato: 'ff6347',
        Qe: '40e0d0',
        viTet: 'ee82ee',
        JHt: 'f5deb3',
        wEte: 'ffffff',
        wEtesmoke: 'f5f5f5',
        Lw: 'ffff00',
        LwgYF: '9acd32'
    };
    function unpack() {
        const unpacked = {};
        const keys = Object.keys(names$1);
        const tkeys = Object.keys(map$2);
        let i, j, k, ok, nk;
        for (i = 0; i < keys.length; i++) {
            ok = nk = keys[i];
            for (j = 0; j < tkeys.length; j++) {
                k = tkeys[j];
                nk = nk.replace(k, map$2[k]);
            }
            k = parseInt(names$1[ok], 16);
            unpacked[nk] = [k >> 16 & 0xFF, k >> 8 & 0xFF, k & 0xFF];
        }
        return unpacked;
    }
    let names;
    function nameParse(str) {
        if (!names) {
            names = unpack();
            names.transparent = [0, 0, 0, 0];
        }
        const a = names[str.toLowerCase()];
        return a && {
            r: a[0],
            g: a[1],
            b: a[2],
            a: a.length === 4 ? a[3] : 255
        };
    }
    const RGB_RE = /^rgba?\(\s*([-+.\d]+)(%)?[\s,]+([-+.e\d]+)(%)?[\s,]+([-+.e\d]+)(%)?(?:[\s,/]+([-+.e\d]+)(%)?)?\s*\)$/;
    function rgbParse(str) {
        const m = RGB_RE.exec(str);
        let a = 255;
        let r, g, b;
        if (!m) {
            return;
        }
        if (m[7] !== r) {
            const v = +m[7];
            a = m[8] ? p2b(v) : lim(v * 255, 0, 255);
        }
        r = +m[1];
        g = +m[3];
        b = +m[5];
        r = 255 & (m[2] ? p2b(r) : lim(r, 0, 255));
        g = 255 & (m[4] ? p2b(g) : lim(g, 0, 255));
        b = 255 & (m[6] ? p2b(b) : lim(b, 0, 255));
        return {
            r: r,
            g: g,
            b: b,
            a: a
        };
    }
    function rgbString(v) {
        return v && (
            v.a < 255
                ? `rgba(${v.r}, ${v.g}, ${v.b}, ${b2n(v.a)})`
                : `rgb(${v.r}, ${v.g}, ${v.b})`
        );
    }
    const to = v => v <= 0.0031308 ? v * 12.92 : Math.pow(v, 1.0 / 2.4) * 1.055 - 0.055;
    const from = v => v <= 0.04045 ? v / 12.92 : Math.pow((v + 0.055) / 1.055, 2.4);
    function interpolate$1(rgb1, rgb2, t) {
        const r = from(b2n(rgb1.r));
        const g = from(b2n(rgb1.g));
        const b = from(b2n(rgb1.b));
        return {
            r: n2b(to(r + t * (from(b2n(rgb2.r)) - r))),
            g: n2b(to(g + t * (from(b2n(rgb2.g)) - g))),
            b: n2b(to(b + t * (from(b2n(rgb2.b)) - b))),
            a: rgb1.a + t * (rgb2.a - rgb1.a)
        };
    }
    function modHSL(v, i, ratio) {
        if (v) {
            let tmp = rgb2hsl(v);
            tmp[i] = Math.max(0, Math.min(tmp[i] + tmp[i] * ratio, i === 0 ? 360 : 1));
            tmp = hsl2rgb(tmp);
            v.r = tmp[0];
            v.g = tmp[1];
            v.b = tmp[2];
        }
    }
    function clone(v, proto) {
        return v ? Object.assign(proto || {}, v) : v;
    }
    function fromObject(input) {
        var v = {r: 0, g: 0, b: 0, a: 255};
        if (Array.isArray(input)) {
            if (input.length >= 3) {
                v = {r: input[0], g: input[1], b: input[2], a: 255};
                if (input.length > 3) {
                    v.a = n2b(input[3]);
                }
            }
        } else {
            v = clone(input, {r: 0, g: 0, b: 0, a: 1});
            v.a = n2b(v.a);
        }
        return v;
    }
    function functionParse(str) {
        if (str.charAt(0) === 'r') {
            return rgbParse(str);
        }
        return hueParse(str);
    }
    class Color {
        constructor(input) {
            if (input instanceof Color) {
                return input;
            }
            const type = typeof input;
            let v;
            if (type === 'object') {
                v = fromObject(input);
            } else if (type === 'string') {
                v = hexParse(input) || nameParse(input) || functionParse(input);
            }
            this._rgb = v;
            this._valid = !!v;
        }
        get valid() {
            return this._valid;
        }
        get rgb() {
            var v = clone(this._rgb);
            if (v) {
                v.a = b2n(v.a);
            }
            return v;
        }
        set rgb(obj) {
            this._rgb = fromObject(obj);
        }
        rgbString() {
            return this._valid ? rgbString(this._rgb) : undefined;
        }
        hexString() {
            return this._valid ? hexString(this._rgb) : undefined;
        }
        hslString() {
            return this._valid ? hslString(this._rgb) : undefined;
        }
        mix(color, weight) {
            if (color) {
                const c1 = this.rgb;
                const c2 = color.rgb;
                let w2;
                const p = weight === w2 ? 0.5 : weight;
                const w = 2 * p - 1;
                const a = c1.a - c2.a;
                const w1 = ((w * a === -1 ? w : (w + a) / (1 + w * a)) + 1) / 2.0;
                w2 = 1 - w1;
                c1.r = 0xFF & w1 * c1.r + w2 * c2.r + 0.5;
                c1.g = 0xFF & w1 * c1.g + w2 * c2.g + 0.5;
                c1.b = 0xFF & w1 * c1.b + w2 * c2.b + 0.5;
                c1.a = p * c1.a + (1 - p) * c2.a;
                this.rgb = c1;
            }
            return this;
        }
        interpolate(color, t) {
            if (color) {
                this._rgb = interpolate$1(this._rgb, color._rgb, t);
            }
            return this;
        }
        clone() {
            return new Color(this.rgb);
        }
        alpha(a) {
            this._rgb.a = n2b(a);
            return this;
        }
        clearer(ratio) {
            const rgb = this._rgb;
            rgb.a *= 1 - ratio;
            return this;
        }
        greyscale() {
            const rgb = this._rgb;
            const val = round(rgb.r * 0.3 + rgb.g * 0.59 + rgb.b * 0.11);
            rgb.r = rgb.g = rgb.b = val;
            return this;
        }
        opaquer(ratio) {
            const rgb = this._rgb;
            rgb.a *= 1 + ratio;
            return this;
        }
        negate() {
            const v = this._rgb;
            v.r = 255 - v.r;
            v.g = 255 - v.g;
            v.b = 255 - v.b;
            return this;
        }
        lighten(ratio) {
            modHSL(this._rgb, 2, ratio);
            return this;
        }
        darken(ratio) {
            modHSL(this._rgb, 2, -ratio);
            return this;
        }
        saturate(ratio) {
            modHSL(this._rgb, 1, ratio);
            return this;
        }
        desaturate(ratio) {
            modHSL(this._rgb, 1, -ratio);
            return this;
        }
        rotate(deg) {
            rotate(this._rgb, deg);
            return this;
        }
    }
    function index_esm(input) {
        return new Color(input);
    }

    function isPatternOrGradient(value) {
        if (value && typeof value === 'object') {
            const type = value.toString();
            return type === '[object CanvasPattern]' || type === '[object CanvasGradient]';
        }
        return false;
    }
    function color(value) {
        return isPatternOrGradient(value) ? value : index_esm(value);
    }
    function getHoverColor(value) {
        return isPatternOrGradient(value)
            ? value
            : index_esm(value).saturate(0.5).darken(0.1).hexString();
    }

    const overrides = Object.create(null);
    const descriptors = Object.create(null);
    function getScope$1(node, key) {
        if (!key) {
            return node;
        }
        const keys = key.split('.');
        for (let i = 0, n = keys.length; i < n; ++i) {
            const k = keys[i];
            node = node[k] || (node[k] = Object.create(null));
        }
        return node;
    }
    function set(root, scope, values) {
        if (typeof scope === 'string') {
            return merge(getScope$1(root, scope), values);
        }
        return merge(getScope$1(root, ''), scope);
    }
    class Defaults {
        constructor(_descriptors) {
            this.animation = undefined;
            this.backgroundColor = 'rgba(0,0,0,0.1)';
            this.borderColor = 'rgba(0,0,0,0.1)';
            this.color = '#666';
            this.datasets = {};
            this.devicePixelRatio = (context) => context.chart.platform.getDevicePixelRatio();
            this.elements = {};
            this.events = [
                'mousemove',
                'mouseout',
                'click',
                'touchstart',
                'touchmove'
            ];
            this.font = {
                family: "'Helvetica Neue', 'Helvetica', 'Arial', sans-serif",
                size: 12,
                style: 'normal',
                lineHeight: 1.2,
                weight: null
            };
            this.hover = {};
            this.hoverBackgroundColor = (ctx, options) => getHoverColor(options.backgroundColor);
            this.hoverBorderColor = (ctx, options) => getHoverColor(options.borderColor);
            this.hoverColor = (ctx, options) => getHoverColor(options.color);
            this.indexAxis = 'x';
            this.interaction = {
                mode: 'nearest',
                intersect: true,
                includeInvisible: false
            };
            this.maintainAspectRatio = true;
            this.onHover = null;
            this.onClick = null;
            this.parsing = true;
            this.plugins = {};
            this.responsive = true;
            this.scale = undefined;
            this.scales = {};
            this.showLine = true;
            this.drawActiveElementsOnTop = true;
            this.describe(_descriptors);
        }
        set(scope, values) {
            return set(this, scope, values);
        }
        get(scope) {
            return getScope$1(this, scope);
        }
        describe(scope, values) {
            return set(descriptors, scope, values);
        }
        override(scope, values) {
            return set(overrides, scope, values);
        }
        route(scope, name, targetScope, targetName) {
            const scopeObject = getScope$1(this, scope);
            const targetScopeObject = getScope$1(this, targetScope);
            const privateName = '_' + name;
            Object.defineProperties(scopeObject, {
                [privateName]: {
                    value: scopeObject[name],
                    writable: true
                },
                [name]: {
                    enumerable: true,
                    get() {
                        const local = this[privateName];
                        const target = targetScopeObject[targetName];
                        if (isObject(local)) {
                            return Object.assign({}, target, local);
                        }
                        return valueOrDefault(local, target);
                    },
                    set(value) {
                        this[privateName] = value;
                    }
                }
            });
        }
    }
    var defaults = new Defaults({
        _scriptable: (name) => !name.startsWith('on'),
        _indexable: (name) => name !== 'events',
        hover: {
            _fallback: 'interaction'
        },
        interaction: {
            _scriptable: false,
            _indexable: false,
        }
    });

    function _isDomSupported() {
        return typeof window !== 'undefined' && typeof document !== 'undefined';
    }
    function _getParentNode(domNode) {
        let parent = domNode.parentNode;
        if (parent && parent.toString() === '[object ShadowRoot]') {
            parent = parent.host;
        }
        return parent;
    }
    function parseMaxStyle(styleValue, node, parentProperty) {
        let valueInPixels;
        if (typeof styleValue === 'string') {
            valueInPixels = parseInt(styleValue, 10);
            if (styleValue.indexOf('%') !== -1) {
                valueInPixels = valueInPixels / 100 * node.parentNode[parentProperty];
            }
        } else {
            valueInPixels = styleValue;
        }
        return valueInPixels;
    }
    const getComputedStyle = (element) => window.getComputedStyle(element, null);
    function getStyle(el, property) {
        return getComputedStyle(el).getPropertyValue(property);
    }
    const positions = ['top', 'right', 'bottom', 'left'];
    function getPositionedStyle(styles, style, suffix) {
        const result = {};
        suffix = suffix ? '-' + suffix : '';
        for (let i = 0; i < 4; i++) {
            const pos = positions[i];
            result[pos] = parseFloat(styles[style + '-' + pos + suffix]) || 0;
        }
        result.width = result.left + result.right;
        result.height = result.top + result.bottom;
        return result;
    }
    const useOffsetPos = (x, y, target) => (x > 0 || y > 0) && (!target || !target.shadowRoot);
    function getCanvasPosition(e, canvas) {
        const touches = e.touches;
        const source = touches && touches.length ? touches[0] : e;
        const {offsetX, offsetY} = source;
        let box = false;
        let x, y;
        if (useOffsetPos(offsetX, offsetY, e.target)) {
            x = offsetX;
            y = offsetY;
        } else {
            const rect = canvas.getBoundingClientRect();
            x = source.clientX - rect.left;
            y = source.clientY - rect.top;
            box = true;
        }
        return {x, y, box};
    }
    function getRelativePosition(evt, chart) {
        if ('native' in evt) {
            return evt;
        }
        const {canvas, currentDevicePixelRatio} = chart;
        const style = getComputedStyle(canvas);
        const borderBox = style.boxSizing === 'border-box';
        const paddings = getPositionedStyle(style, 'padding');
        const borders = getPositionedStyle(style, 'border', 'width');
        const {x, y, box} = getCanvasPosition(evt, canvas);
        const xOffset = paddings.left + (box && borders.left);
        const yOffset = paddings.top + (box && borders.top);
        let {width, height} = chart;
        if (borderBox) {
            width -= paddings.width + borders.width;
            height -= paddings.height + borders.height;
        }
        return {
            x: Math.round((x - xOffset) / width * canvas.width / currentDevicePixelRatio),
            y: Math.round((y - yOffset) / height * canvas.height / currentDevicePixelRatio)
        };
    }
    function getContainerSize(canvas, width, height) {
        let maxWidth, maxHeight;
        if (width === undefined || height === undefined) {
            const container = _getParentNode(canvas);
            if (!container) {
                width = canvas.clientWidth;
                height = canvas.clientHeight;
            } else {
                const rect = container.getBoundingClientRect();
                const containerStyle = getComputedStyle(container);
                const containerBorder = getPositionedStyle(containerStyle, 'border', 'width');
                const containerPadding = getPositionedStyle(containerStyle, 'padding');
                width = rect.width - containerPadding.width - containerBorder.width;
                height = rect.height - containerPadding.height - containerBorder.height;
                maxWidth = parseMaxStyle(containerStyle.maxWidth, container, 'clientWidth');
                maxHeight = parseMaxStyle(containerStyle.maxHeight, container, 'clientHeight');
            }
        }
        return {
            width,
            height,
            maxWidth: maxWidth || INFINITY,
            maxHeight: maxHeight || INFINITY
        };
    }
    const round1 = v => Math.round(v * 10) / 10;
    function getMaximumSize(canvas, bbWidth, bbHeight, aspectRatio) {
        const style = getComputedStyle(canvas);
        const margins = getPositionedStyle(style, 'margin');
        const maxWidth = parseMaxStyle(style.maxWidth, canvas, 'clientWidth') || INFINITY;
        const maxHeight = parseMaxStyle(style.maxHeight, canvas, 'clientHeight') || INFINITY;
        const containerSize = getContainerSize(canvas, bbWidth, bbHeight);
        let {width, height} = containerSize;
        if (style.boxSizing === 'content-box') {
            const borders = getPositionedStyle(style, 'border', 'width');
            const paddings = getPositionedStyle(style, 'padding');
            width -= paddings.width + borders.width;
            height -= paddings.height + borders.height;
        }
        width = Math.max(0, width - margins.width);
        height = Math.max(0, aspectRatio ? Math.floor(width / aspectRatio) : height - margins.height);
        width = round1(Math.min(width, maxWidth, containerSize.maxWidth));
        height = round1(Math.min(height, maxHeight, containerSize.maxHeight));
        if (width && !height) {
            height = round1(width / 2);
        }
        return {
            width,
            height
        };
    }
    function retinaScale(chart, forceRatio, forceStyle) {
        const pixelRatio = forceRatio || 1;
        const deviceHeight = Math.floor(chart.height * pixelRatio);
        const deviceWidth = Math.floor(chart.width * pixelRatio);
        chart.height = deviceHeight / pixelRatio;
        chart.width = deviceWidth / pixelRatio;
        const canvas = chart.canvas;
        if (canvas.style && (forceStyle || (!canvas.style.height && !canvas.style.width))) {
            canvas.style.height = `${chart.height}px`;
            canvas.style.width = `${chart.width}px`;
        }
        if (chart.currentDevicePixelRatio !== pixelRatio
            || canvas.height !== deviceHeight
            || canvas.width !== deviceWidth) {
            chart.currentDevicePixelRatio = pixelRatio;
            canvas.height = deviceHeight;
            canvas.width = deviceWidth;
            chart.ctx.setTransform(pixelRatio, 0, 0, pixelRatio, 0, 0);
            return true;
        }
        return false;
    }
    const supportsEventListenerOptions = (function() {
        let passiveSupported = false;
        try {
            const options = {
                get passive() {
                    passiveSupported = true;
                    return false;
                }
            };
            window.addEventListener('test', null, options);
            window.removeEventListener('test', null, options);
        } catch (e) {
        }
        return passiveSupported;
    }());
    function readUsedSize(element, property) {
        const value = getStyle(element, property);
        const matches = value && value.match(/^(\d+)(\.\d+)?px$/);
        return matches ? +matches[1] : undefined;
    }

    function toFontString(font) {
        if (!font || isNullOrUndef(font.size) || isNullOrUndef(font.family)) {
            return null;
        }
        return (font.style ? font.style + ' ' : '')
            + (font.weight ? font.weight + ' ' : '')
            + font.size + 'px '
            + font.family;
    }
    function _measureText(ctx, data, gc, longest, string) {
        let textWidth = data[string];
        if (!textWidth) {
            textWidth = data[string] = ctx.measureText(string).width;
            gc.push(string);
        }
        if (textWidth > longest) {
            longest = textWidth;
        }
        return longest;
    }
    function _longestText(ctx, font, arrayOfThings, cache) {
        cache = cache || {};
        let data = cache.data = cache.data || {};
        let gc = cache.garbageCollect = cache.garbageCollect || [];
        if (cache.font !== font) {
            data = cache.data = {};
            gc = cache.garbageCollect = [];
            cache.font = font;
        }
        ctx.save();
        ctx.font = font;
        let longest = 0;
        const ilen = arrayOfThings.length;
        let i, j, jlen, thing, nestedThing;
        for (i = 0; i < ilen; i++) {
            thing = arrayOfThings[i];
            if (thing !== undefined && thing !== null && isArray(thing) !== true) {
                longest = _measureText(ctx, data, gc, longest, thing);
            } else if (isArray(thing)) {
                for (j = 0, jlen = thing.length; j < jlen; j++) {
                    nestedThing = thing[j];
                    if (nestedThing !== undefined && nestedThing !== null && !isArray(nestedThing)) {
                        longest = _measureText(ctx, data, gc, longest, nestedThing);
                    }
                }
            }
        }
        ctx.restore();
        const gcLen = gc.length / 2;
        if (gcLen > arrayOfThings.length) {
            for (i = 0; i < gcLen; i++) {
                delete data[gc[i]];
            }
            gc.splice(0, gcLen);
        }
        return longest;
    }
    function _alignPixel(chart, pixel, width) {
        const devicePixelRatio = chart.currentDevicePixelRatio;
        const halfWidth = width !== 0 ? Math.max(width / 2, 0.5) : 0;
        return Math.round((pixel - halfWidth) * devicePixelRatio) / devicePixelRatio + halfWidth;
    }
    function clearCanvas(canvas, ctx) {
        ctx = ctx || canvas.getContext('2d');
        ctx.save();
        ctx.resetTransform();
        ctx.clearRect(0, 0, canvas.width, canvas.height);
        ctx.restore();
    }
    function drawPoint(ctx, options, x, y) {
        drawPointLegend(ctx, options, x, y, null);
    }
    function drawPointLegend(ctx, options, x, y, w) {
        let type, xOffset, yOffset, size, cornerRadius, width;
        const style = options.pointStyle;
        const rotation = options.rotation;
        const radius = options.radius;
        let rad = (rotation || 0) * RAD_PER_DEG;
        if (style && typeof style === 'object') {
            type = style.toString();
            if (type === '[object HTMLImageElement]' || type === '[object HTMLCanvasElement]') {
                ctx.save();
                ctx.translate(x, y);
                ctx.rotate(rad);
                ctx.drawImage(style, -style.width / 2, -style.height / 2, style.width, style.height);
                ctx.restore();
                return;
            }
        }
        if (isNaN(radius) || radius <= 0) {
            return;
        }
        ctx.beginPath();
        switch (style) {
            default:
                if (w) {
                    ctx.ellipse(x, y, w / 2, radius, 0, 0, TAU);
                } else {
                    ctx.arc(x, y, radius, 0, TAU);
                }
                ctx.closePath();
                break;
            case 'triangle':
                ctx.moveTo(x + Math.sin(rad) * radius, y - Math.cos(rad) * radius);
                rad += TWO_THIRDS_PI;
                ctx.lineTo(x + Math.sin(rad) * radius, y - Math.cos(rad) * radius);
                rad += TWO_THIRDS_PI;
                ctx.lineTo(x + Math.sin(rad) * radius, y - Math.cos(rad) * radius);
                ctx.closePath();
                break;
            case 'rectRounded':
                cornerRadius = radius * 0.516;
                size = radius - cornerRadius;
                xOffset = Math.cos(rad + QUARTER_PI) * size;
                yOffset = Math.sin(rad + QUARTER_PI) * size;
                ctx.arc(x - xOffset, y - yOffset, cornerRadius, rad - PI, rad - HALF_PI);
                ctx.arc(x + yOffset, y - xOffset, cornerRadius, rad - HALF_PI, rad);
                ctx.arc(x + xOffset, y + yOffset, cornerRadius, rad, rad + HALF_PI);
                ctx.arc(x - yOffset, y + xOffset, cornerRadius, rad + HALF_PI, rad + PI);
                ctx.closePath();
                break;
            case 'rect':
                if (!rotation) {
                    size = Math.SQRT1_2 * radius;
                    width = w ? w / 2 : size;
                    ctx.rect(x - width, y - size, 2 * width, 2 * size);
                    break;
                }
                rad += QUARTER_PI;
            case 'rectRot':
                xOffset = Math.cos(rad) * radius;
                yOffset = Math.sin(rad) * radius;
                ctx.moveTo(x - xOffset, y - yOffset);
                ctx.lineTo(x + yOffset, y - xOffset);
                ctx.lineTo(x + xOffset, y + yOffset);
                ctx.lineTo(x - yOffset, y + xOffset);
                ctx.closePath();
                break;
            case 'crossRot':
                rad += QUARTER_PI;
            case 'cross':
                xOffset = Math.cos(rad) * radius;
                yOffset = Math.sin(rad) * radius;
                ctx.moveTo(x - xOffset, y - yOffset);
                ctx.lineTo(x + xOffset, y + yOffset);
                ctx.moveTo(x + yOffset, y - xOffset);
                ctx.lineTo(x - yOffset, y + xOffset);
                break;
            case 'star':
                xOffset = Math.cos(rad) * radius;
                yOffset = Math.sin(rad) * radius;
                ctx.moveTo(x - xOffset, y - yOffset);
                ctx.lineTo(x + xOffset, y + yOffset);
                ctx.moveTo(x + yOffset, y - xOffset);
                ctx.lineTo(x - yOffset, y + xOffset);
                rad += QUARTER_PI;
                xOffset = Math.cos(rad) * radius;
                yOffset = Math.sin(rad) * radius;
                ctx.moveTo(x - xOffset, y - yOffset);
                ctx.lineTo(x + xOffset, y + yOffset);
                ctx.moveTo(x + yOffset, y - xOffset);
                ctx.lineTo(x - yOffset, y + xOffset);
                break;
            case 'line':
                xOffset = w ? w / 2 : Math.cos(rad) * radius;
                yOffset = Math.sin(rad) * radius;
                ctx.moveTo(x - xOffset, y - yOffset);
                ctx.lineTo(x + xOffset, y + yOffset);
                break;
            case 'dash':
                ctx.moveTo(x, y);
                ctx.lineTo(x + Math.cos(rad) * radius, y + Math.sin(rad) * radius);
                break;
        }
        ctx.fill();
        if (options.borderWidth > 0) {
            ctx.stroke();
        }
    }
    function _isPointInArea(point, area, margin) {
        margin = margin || 0.5;
        return !area || (point && point.x > area.left - margin && point.x < area.right + margin &&
            point.y > area.top - margin && point.y < area.bottom + margin);
    }
    function clipArea(ctx, area) {
        ctx.save();
        ctx.beginPath();
        ctx.rect(area.left, area.top, area.right - area.left, area.bottom - area.top);
        ctx.clip();
    }
    function unclipArea(ctx) {
        ctx.restore();
    }
    function _steppedLineTo(ctx, previous, target, flip, mode) {
        if (!previous) {
            return ctx.lineTo(target.x, target.y);
        }
        if (mode === 'middle') {
            const midpoint = (previous.x + target.x) / 2.0;
            ctx.lineTo(midpoint, previous.y);
            ctx.lineTo(midpoint, target.y);
        } else if (mode === 'after' !== !!flip) {
            ctx.lineTo(previous.x, target.y);
        } else {
            ctx.lineTo(target.x, previous.y);
        }
        ctx.lineTo(target.x, target.y);
    }
    function _bezierCurveTo(ctx, previous, target, flip) {
        if (!previous) {
            return ctx.lineTo(target.x, target.y);
        }
        ctx.bezierCurveTo(
            flip ? previous.cp1x : previous.cp2x,
            flip ? previous.cp1y : previous.cp2y,
            flip ? target.cp2x : target.cp1x,
            flip ? target.cp2y : target.cp1y,
            target.x,
            target.y);
    }
    function renderText(ctx, text, x, y, font, opts = {}) {
        const lines = isArray(text) ? text : [text];
        const stroke = opts.strokeWidth > 0 && opts.strokeColor !== '';
        let i, line;
        ctx.save();
        ctx.font = font.string;
        setRenderOpts(ctx, opts);
        for (i = 0; i < lines.length; ++i) {
            line = lines[i];
            if (stroke) {
                if (opts.strokeColor) {
                    ctx.strokeStyle = opts.strokeColor;
                }
                if (!isNullOrUndef(opts.strokeWidth)) {
                    ctx.lineWidth = opts.strokeWidth;
                }
                ctx.strokeText(line, x, y, opts.maxWidth);
            }
            ctx.fillText(line, x, y, opts.maxWidth);
            decorateText(ctx, x, y, line, opts);
            y += font.lineHeight;
        }
        ctx.restore();
    }
    function setRenderOpts(ctx, opts) {
        if (opts.translation) {
            ctx.translate(opts.translation[0], opts.translation[1]);
        }
        if (!isNullOrUndef(opts.rotation)) {
            ctx.rotate(opts.rotation);
        }
        if (opts.color) {
            ctx.fillStyle = opts.color;
        }
        if (opts.textAlign) {
            ctx.textAlign = opts.textAlign;
        }
        if (opts.textBaseline) {
            ctx.textBaseline = opts.textBaseline;
        }
    }
    function decorateText(ctx, x, y, line, opts) {
        if (opts.strikethrough || opts.underline) {
            const metrics = ctx.measureText(line);
            const left = x - metrics.actualBoundingBoxLeft;
            const right = x + metrics.actualBoundingBoxRight;
            const top = y - metrics.actualBoundingBoxAscent;
            const bottom = y + metrics.actualBoundingBoxDescent;
            const yDecoration = opts.strikethrough ? (top + bottom) / 2 : bottom;
            ctx.strokeStyle = ctx.fillStyle;
            ctx.beginPath();
            ctx.lineWidth = opts.decorationWidth || 2;
            ctx.moveTo(left, yDecoration);
            ctx.lineTo(right, yDecoration);
            ctx.stroke();
        }
    }
    function addRoundedRectPath(ctx, rect) {
        const {x, y, w, h, radius} = rect;
        ctx.arc(x + radius.topLeft, y + radius.topLeft, radius.topLeft, -HALF_PI, PI, true);
        ctx.lineTo(x, y + h - radius.bottomLeft);
        ctx.arc(x + radius.bottomLeft, y + h - radius.bottomLeft, radius.bottomLeft, PI, HALF_PI, true);
        ctx.lineTo(x + w - radius.bottomRight, y + h);
        ctx.arc(x + w - radius.bottomRight, y + h - radius.bottomRight, radius.bottomRight, HALF_PI, 0, true);
        ctx.lineTo(x + w, y + radius.topRight);
        ctx.arc(x + w - radius.topRight, y + radius.topRight, radius.topRight, 0, -HALF_PI, true);
        ctx.lineTo(x + radius.topLeft, y);
    }

    function _createResolver(scopes, prefixes = [''], rootScopes = scopes, fallback, getTarget = () => scopes[0]) {
        if (!defined(fallback)) {
            fallback = _resolve('_fallback', scopes);
        }
        const cache = {
            [Symbol.toStringTag]: 'Object',
            _cacheable: true,
            _scopes: scopes,
            _rootScopes: rootScopes,
            _fallback: fallback,
            _getTarget: getTarget,
            override: (scope) => _createResolver([scope, ...scopes], prefixes, rootScopes, fallback),
        };
        return new Proxy(cache, {
            deleteProperty(target, prop) {
                delete target[prop];
                delete target._keys;
                delete scopes[0][prop];
                return true;
            },
            get(target, prop) {
                return _cached(target, prop,
                    () => _resolveWithPrefixes(prop, prefixes, scopes, target));
            },
            getOwnPropertyDescriptor(target, prop) {
                return Reflect.getOwnPropertyDescriptor(target._scopes[0], prop);
            },
            getPrototypeOf() {
                return Reflect.getPrototypeOf(scopes[0]);
            },
            has(target, prop) {
                return getKeysFromAllScopes(target).includes(prop);
            },
            ownKeys(target) {
                return getKeysFromAllScopes(target);
            },
            set(target, prop, value) {
                const storage = target._storage || (target._storage = getTarget());
                target[prop] = storage[prop] = value;
                delete target._keys;
                return true;
            }
        });
    }
    function _attachContext(proxy, context, subProxy, descriptorDefaults) {
        const cache = {
            _cacheable: false,
            _proxy: proxy,
            _context: context,
            _subProxy: subProxy,
            _stack: new Set(),
            _descriptors: _descriptors(proxy, descriptorDefaults),
            setContext: (ctx) => _attachContext(proxy, ctx, subProxy, descriptorDefaults),
            override: (scope) => _attachContext(proxy.override(scope), context, subProxy, descriptorDefaults)
        };
        return new Proxy(cache, {
            deleteProperty(target, prop) {
                delete target[prop];
                delete proxy[prop];
                return true;
            },
            get(target, prop, receiver) {
                return _cached(target, prop,
                    () => _resolveWithContext(target, prop, receiver));
            },
            getOwnPropertyDescriptor(target, prop) {
                return target._descriptors.allKeys
                    ? Reflect.has(proxy, prop) ? {enumerable: true, configurable: true} : undefined
                    : Reflect.getOwnPropertyDescriptor(proxy, prop);
            },
            getPrototypeOf() {
                return Reflect.getPrototypeOf(proxy);
            },
            has(target, prop) {
                return Reflect.has(proxy, prop);
            },
            ownKeys() {
                return Reflect.ownKeys(proxy);
            },
            set(target, prop, value) {
                proxy[prop] = value;
                delete target[prop];
                return true;
            }
        });
    }
    function _descriptors(proxy, defaults = {scriptable: true, indexable: true}) {
        const {_scriptable = defaults.scriptable, _indexable = defaults.indexable, _allKeys = defaults.allKeys} = proxy;
        return {
            allKeys: _allKeys,
            scriptable: _scriptable,
            indexable: _indexable,
            isScriptable: isFunction(_scriptable) ? _scriptable : () => _scriptable,
            isIndexable: isFunction(_indexable) ? _indexable : () => _indexable
        };
    }
    const readKey = (prefix, name) => prefix ? prefix + _capitalize(name) : name;
    const needsSubResolver = (prop, value) => isObject(value) && prop !== 'adapters' &&
        (Object.getPrototypeOf(value) === null || value.constructor === Object);
    function _cached(target, prop, resolve) {
        if (Object.prototype.hasOwnProperty.call(target, prop)) {
            return target[prop];
        }
        const value = resolve();
        target[prop] = value;
        return value;
    }
    function _resolveWithContext(target, prop, receiver) {
        const {_proxy, _context, _subProxy, _descriptors: descriptors} = target;
        let value = _proxy[prop];
        if (isFunction(value) && descriptors.isScriptable(prop)) {
            value = _resolveScriptable(prop, value, target, receiver);
        }
        if (isArray(value) && value.length) {
            value = _resolveArray(prop, value, target, descriptors.isIndexable);
        }
        if (needsSubResolver(prop, value)) {
            value = _attachContext(value, _context, _subProxy && _subProxy[prop], descriptors);
        }
        return value;
    }
    function _resolveScriptable(prop, value, target, receiver) {
        const {_proxy, _context, _subProxy, _stack} = target;
        if (_stack.has(prop)) {
            throw new Error('Recursion detected: ' + Array.from(_stack).join('->') + '->' + prop);
        }
        _stack.add(prop);
        value = value(_context, _subProxy || receiver);
        _stack.delete(prop);
        if (needsSubResolver(prop, value)) {
            value = createSubResolver(_proxy._scopes, _proxy, prop, value);
        }
        return value;
    }
    function _resolveArray(prop, value, target, isIndexable) {
        const {_proxy, _context, _subProxy, _descriptors: descriptors} = target;
        if (defined(_context.index) && isIndexable(prop)) {
            value = value[_context.index % value.length];
        } else if (isObject(value[0])) {
            const arr = value;
            const scopes = _proxy._scopes.filter(s => s !== arr);
            value = [];
            for (const item of arr) {
                const resolver = createSubResolver(scopes, _proxy, prop, item);
                value.push(_attachContext(resolver, _context, _subProxy && _subProxy[prop], descriptors));
            }
        }
        return value;
    }
    function resolveFallback(fallback, prop, value) {
        return isFunction(fallback) ? fallback(prop, value) : fallback;
    }
    const getScope = (key, parent) => key === true ? parent
        : typeof key === 'string' ? resolveObjectKey(parent, key) : undefined;
    function addScopes(set, parentScopes, key, parentFallback, value) {
        for (const parent of parentScopes) {
            const scope = getScope(key, parent);
            if (scope) {
                set.add(scope);
                const fallback = resolveFallback(scope._fallback, key, value);
                if (defined(fallback) && fallback !== key && fallback !== parentFallback) {
                    return fallback;
                }
            } else if (scope === false && defined(parentFallback) && key !== parentFallback) {
                return null;
            }
        }
        return false;
    }
    function createSubResolver(parentScopes, resolver, prop, value) {
        const rootScopes = resolver._rootScopes;
        const fallback = resolveFallback(resolver._fallback, prop, value);
        const allScopes = [...parentScopes, ...rootScopes];
        const set = new Set();
        set.add(value);
        let key = addScopesFromKey(set, allScopes, prop, fallback || prop, value);
        if (key === null) {
            return false;
        }
        if (defined(fallback) && fallback !== prop) {
            key = addScopesFromKey(set, allScopes, fallback, key, value);
            if (key === null) {
                return false;
            }
        }
        return _createResolver(Array.from(set), [''], rootScopes, fallback,
            () => subGetTarget(resolver, prop, value));
    }
    function addScopesFromKey(set, allScopes, key, fallback, item) {
        while (key) {
            key = addScopes(set, allScopes, key, fallback, item);
        }
        return key;
    }
    function subGetTarget(resolver, prop, value) {
        const parent = resolver._getTarget();
        if (!(prop in parent)) {
            parent[prop] = {};
        }
        const target = parent[prop];
        if (isArray(target) && isObject(value)) {
            return value;
        }
        return target;
    }
    function _resolveWithPrefixes(prop, prefixes, scopes, proxy) {
        let value;
        for (const prefix of prefixes) {
            value = _resolve(readKey(prefix, prop), scopes);
            if (defined(value)) {
                return needsSubResolver(prop, value)
                    ? createSubResolver(scopes, proxy, prop, value)
                    : value;
            }
        }
    }
    function _resolve(key, scopes) {
        for (const scope of scopes) {
            if (!scope) {
                continue;
            }
            const value = scope[key];
            if (defined(value)) {
                return value;
            }
        }
    }
    function getKeysFromAllScopes(target) {
        let keys = target._keys;
        if (!keys) {
            keys = target._keys = resolveKeysFromAllScopes(target._scopes);
        }
        return keys;
    }
    function resolveKeysFromAllScopes(scopes) {
        const set = new Set();
        for (const scope of scopes) {
            for (const key of Object.keys(scope).filter(k => !k.startsWith('_'))) {
                set.add(key);
            }
        }
        return Array.from(set);
    }
    function _parseObjectDataRadialScale(meta, data, start, count) {
        const {iScale} = meta;
        const {key = 'r'} = this._parsing;
        const parsed = new Array(count);
        let i, ilen, index, item;
        for (i = 0, ilen = count; i < ilen; ++i) {
            index = i + start;
            item = data[index];
            parsed[i] = {
                r: iScale.parse(resolveObjectKey(item, key), index)
            };
        }
        return parsed;
    }

    const EPSILON = Number.EPSILON || 1e-14;
    const getPoint = (points, i) => i < points.length && !points[i].skip && points[i];
    const getValueAxis = (indexAxis) => indexAxis === 'x' ? 'y' : 'x';
    function splineCurve(firstPoint, middlePoint, afterPoint, t) {
        const previous = firstPoint.skip ? middlePoint : firstPoint;
        const current = middlePoint;
        const next = afterPoint.skip ? middlePoint : afterPoint;
        const d01 = distanceBetweenPoints(current, previous);
        const d12 = distanceBetweenPoints(next, current);
        let s01 = d01 / (d01 + d12);
        let s12 = d12 / (d01 + d12);
        s01 = isNaN(s01) ? 0 : s01;
        s12 = isNaN(s12) ? 0 : s12;
        const fa = t * s01;
        const fb = t * s12;
        return {
            previous: {
                x: current.x - fa * (next.x - previous.x),
                y: current.y - fa * (next.y - previous.y)
            },
            next: {
                x: current.x + fb * (next.x - previous.x),
                y: current.y + fb * (next.y - previous.y)
            }
        };
    }
    function monotoneAdjust(points, deltaK, mK) {
        const pointsLen = points.length;
        let alphaK, betaK, tauK, squaredMagnitude, pointCurrent;
        let pointAfter = getPoint(points, 0);
        for (let i = 0; i < pointsLen - 1; ++i) {
            pointCurrent = pointAfter;
            pointAfter = getPoint(points, i + 1);
            if (!pointCurrent || !pointAfter) {
                continue;
            }
            if (almostEquals(deltaK[i], 0, EPSILON)) {
                mK[i] = mK[i + 1] = 0;
                continue;
            }
            alphaK = mK[i] / deltaK[i];
            betaK = mK[i + 1] / deltaK[i];
            squaredMagnitude = Math.pow(alphaK, 2) + Math.pow(betaK, 2);
            if (squaredMagnitude <= 9) {
                continue;
            }
            tauK = 3 / Math.sqrt(squaredMagnitude);
            mK[i] = alphaK * tauK * deltaK[i];
            mK[i + 1] = betaK * tauK * deltaK[i];
        }
    }
    function monotoneCompute(points, mK, indexAxis = 'x') {
        const valueAxis = getValueAxis(indexAxis);
        const pointsLen = points.length;
        let delta, pointBefore, pointCurrent;
        let pointAfter = getPoint(points, 0);
        for (let i = 0; i < pointsLen; ++i) {
            pointBefore = pointCurrent;
            pointCurrent = pointAfter;
            pointAfter = getPoint(points, i + 1);
            if (!pointCurrent) {
                continue;
            }
            const iPixel = pointCurrent[indexAxis];
            const vPixel = pointCurrent[valueAxis];
            if (pointBefore) {
                delta = (iPixel - pointBefore[indexAxis]) / 3;
                pointCurrent[`cp1${indexAxis}`] = iPixel - delta;
                pointCurrent[`cp1${valueAxis}`] = vPixel - delta * mK[i];
            }
            if (pointAfter) {
                delta = (pointAfter[indexAxis] - iPixel) / 3;
                pointCurrent[`cp2${indexAxis}`] = iPixel + delta;
                pointCurrent[`cp2${valueAxis}`] = vPixel + delta * mK[i];
            }
        }
    }
    function splineCurveMonotone(points, indexAxis = 'x') {
        const valueAxis = getValueAxis(indexAxis);
        const pointsLen = points.length;
        const deltaK = Array(pointsLen).fill(0);
        const mK = Array(pointsLen);
        let i, pointBefore, pointCurrent;
        let pointAfter = getPoint(points, 0);
        for (i = 0; i < pointsLen; ++i) {
            pointBefore = pointCurrent;
            pointCurrent = pointAfter;
            pointAfter = getPoint(points, i + 1);
            if (!pointCurrent) {
                continue;
            }
            if (pointAfter) {
                const slopeDelta = pointAfter[indexAxis] - pointCurrent[indexAxis];
                deltaK[i] = slopeDelta !== 0 ? (pointAfter[valueAxis] - pointCurrent[valueAxis]) / slopeDelta : 0;
            }
            mK[i] = !pointBefore ? deltaK[i]
                : !pointAfter ? deltaK[i - 1]
                    : (sign(deltaK[i - 1]) !== sign(deltaK[i])) ? 0
                        : (deltaK[i - 1] + deltaK[i]) / 2;
        }
        monotoneAdjust(points, deltaK, mK);
        monotoneCompute(points, mK, indexAxis);
    }
    function capControlPoint(pt, min, max) {
        return Math.max(Math.min(pt, max), min);
    }
    function capBezierPoints(points, area) {
        let i, ilen, point, inArea, inAreaPrev;
        let inAreaNext = _isPointInArea(points[0], area);
        for (i = 0, ilen = points.length; i < ilen; ++i) {
            inAreaPrev = inArea;
            inArea = inAreaNext;
            inAreaNext = i < ilen - 1 && _isPointInArea(points[i + 1], area);
            if (!inArea) {
                continue;
            }
            point = points[i];
            if (inAreaPrev) {
                point.cp1x = capControlPoint(point.cp1x, area.left, area.right);
                point.cp1y = capControlPoint(point.cp1y, area.top, area.bottom);
            }
            if (inAreaNext) {
                point.cp2x = capControlPoint(point.cp2x, area.left, area.right);
                point.cp2y = capControlPoint(point.cp2y, area.top, area.bottom);
            }
        }
    }
    function _updateBezierControlPoints(points, options, area, loop, indexAxis) {
        let i, ilen, point, controlPoints;
        if (options.spanGaps) {
            points = points.filter((pt) => !pt.skip);
        }
        if (options.cubicInterpolationMode === 'monotone') {
            splineCurveMonotone(points, indexAxis);
        } else {
            let prev = loop ? points[points.length - 1] : points[0];
            for (i = 0, ilen = points.length; i < ilen; ++i) {
                point = points[i];
                controlPoints = splineCurve(
                    prev,
                    point,
                    points[Math.min(i + 1, ilen - (loop ? 0 : 1)) % ilen],
                    options.tension
                );
                point.cp1x = controlPoints.previous.x;
                point.cp1y = controlPoints.previous.y;
                point.cp2x = controlPoints.next.x;
                point.cp2y = controlPoints.next.y;
                prev = point;
            }
        }
        if (options.capBezierPoints) {
            capBezierPoints(points, area);
        }
    }

    const atEdge = (t) => t === 0 || t === 1;
    const elasticIn = (t, s, p) => -(Math.pow(2, 10 * (t -= 1)) * Math.sin((t - s) * TAU / p));
    const elasticOut = (t, s, p) => Math.pow(2, -10 * t) * Math.sin((t - s) * TAU / p) + 1;
    const effects = {
        linear: t => t,
        easeInQuad: t => t * t,
        easeOutQuad: t => -t * (t - 2),
        easeInOutQuad: t => ((t /= 0.5) < 1)
            ? 0.5 * t * t
            : -0.5 * ((--t) * (t - 2) - 1),
        easeInCubic: t => t * t * t,
        easeOutCubic: t => (t -= 1) * t * t + 1,
        easeInOutCubic: t => ((t /= 0.5) < 1)
            ? 0.5 * t * t * t
            : 0.5 * ((t -= 2) * t * t + 2),
        easeInQuart: t => t * t * t * t,
        easeOutQuart: t => -((t -= 1) * t * t * t - 1),
        easeInOutQuart: t => ((t /= 0.5) < 1)
            ? 0.5 * t * t * t * t
            : -0.5 * ((t -= 2) * t * t * t - 2),
        easeInQuint: t => t * t * t * t * t,
        easeOutQuint: t => (t -= 1) * t * t * t * t + 1,
        easeInOutQuint: t => ((t /= 0.5) < 1)
            ? 0.5 * t * t * t * t * t
            : 0.5 * ((t -= 2) * t * t * t * t + 2),
        easeInSine: t => -Math.cos(t * HALF_PI) + 1,
        easeOutSine: t => Math.sin(t * HALF_PI),
        easeInOutSine: t => -0.5 * (Math.cos(PI * t) - 1),
        easeInExpo: t => (t === 0) ? 0 : Math.pow(2, 10 * (t - 1)),
        easeOutExpo: t => (t === 1) ? 1 : -Math.pow(2, -10 * t) + 1,
        easeInOutExpo: t => atEdge(t) ? t : t < 0.5
            ? 0.5 * Math.pow(2, 10 * (t * 2 - 1))
            : 0.5 * (-Math.pow(2, -10 * (t * 2 - 1)) + 2),
        easeInCirc: t => (t >= 1) ? t : -(Math.sqrt(1 - t * t) - 1),
        easeOutCirc: t => Math.sqrt(1 - (t -= 1) * t),
        easeInOutCirc: t => ((t /= 0.5) < 1)
            ? -0.5 * (Math.sqrt(1 - t * t) - 1)
            : 0.5 * (Math.sqrt(1 - (t -= 2) * t) + 1),
        easeInElastic: t => atEdge(t) ? t : elasticIn(t, 0.075, 0.3),
        easeOutElastic: t => atEdge(t) ? t : elasticOut(t, 0.075, 0.3),
        easeInOutElastic(t) {
            const s = 0.1125;
            const p = 0.45;
            return atEdge(t) ? t :
                t < 0.5
                    ? 0.5 * elasticIn(t * 2, s, p)
                    : 0.5 + 0.5 * elasticOut(t * 2 - 1, s, p);
        },
        easeInBack(t) {
            const s = 1.70158;
            return t * t * ((s + 1) * t - s);
        },
        easeOutBack(t) {
            const s = 1.70158;
            return (t -= 1) * t * ((s + 1) * t + s) + 1;
        },
        easeInOutBack(t) {
            let s = 1.70158;
            if ((t /= 0.5) < 1) {
                return 0.5 * (t * t * (((s *= (1.525)) + 1) * t - s));
            }
            return 0.5 * ((t -= 2) * t * (((s *= (1.525)) + 1) * t + s) + 2);
        },
        easeInBounce: t => 1 - effects.easeOutBounce(1 - t),
        easeOutBounce(t) {
            const m = 7.5625;
            const d = 2.75;
            if (t < (1 / d)) {
                return m * t * t;
            }
            if (t < (2 / d)) {
                return m * (t -= (1.5 / d)) * t + 0.75;
            }
            if (t < (2.5 / d)) {
                return m * (t -= (2.25 / d)) * t + 0.9375;
            }
            return m * (t -= (2.625 / d)) * t + 0.984375;
        },
        easeInOutBounce: t => (t < 0.5)
            ? effects.easeInBounce(t * 2) * 0.5
            : effects.easeOutBounce(t * 2 - 1) * 0.5 + 0.5,
    };

    function _pointInLine(p1, p2, t, mode) {
        return {
            x: p1.x + t * (p2.x - p1.x),
            y: p1.y + t * (p2.y - p1.y)
        };
    }
    function _steppedInterpolation(p1, p2, t, mode) {
        return {
            x: p1.x + t * (p2.x - p1.x),
            y: mode === 'middle' ? t < 0.5 ? p1.y : p2.y
                : mode === 'after' ? t < 1 ? p1.y : p2.y
                    : t > 0 ? p2.y : p1.y
        };
    }
    function _bezierInterpolation(p1, p2, t, mode) {
        const cp1 = {x: p1.cp2x, y: p1.cp2y};
        const cp2 = {x: p2.cp1x, y: p2.cp1y};
        const a = _pointInLine(p1, cp1, t);
        const b = _pointInLine(cp1, cp2, t);
        const c = _pointInLine(cp2, p2, t);
        const d = _pointInLine(a, b, t);
        const e = _pointInLine(b, c, t);
        return _pointInLine(d, e, t);
    }

    const intlCache = new Map();
    function getNumberFormat(locale, options) {
        options = options || {};
        const cacheKey = locale + JSON.stringify(options);
        let formatter = intlCache.get(cacheKey);
        if (!formatter) {
            formatter = new Intl.NumberFormat(locale, options);
            intlCache.set(cacheKey, formatter);
        }
        return formatter;
    }
    function formatNumber(num, locale, options) {
        return getNumberFormat(locale, options).format(num);
    }

    const LINE_HEIGHT = new RegExp(/^(normal|(\d+(?:\.\d+)?)(px|em|%)?)$/);
    const FONT_STYLE = new RegExp(/^(normal|italic|initial|inherit|unset|(oblique( -?[0-9]?[0-9]deg)?))$/);
    function toLineHeight(value, size) {
        const matches = ('' + value).match(LINE_HEIGHT);
        if (!matches || matches[1] === 'normal') {
            return size * 1.2;
        }
        value = +matches[2];
        switch (matches[3]) {
            case 'px':
                return value;
            case '%':
                value /= 100;
                break;
        }
        return size * value;
    }
    const numberOrZero = v => +v || 0;
    function _readValueToProps(value, props) {
        const ret = {};
        const objProps = isObject(props);
        const keys = objProps ? Object.keys(props) : props;
        const read = isObject(value)
            ? objProps
                ? prop => valueOrDefault(value[prop], value[props[prop]])
                : prop => value[prop]
            : () => value;
        for (const prop of keys) {
            ret[prop] = numberOrZero(read(prop));
        }
        return ret;
    }
    function toTRBL(value) {
        return _readValueToProps(value, {top: 'y', right: 'x', bottom: 'y', left: 'x'});
    }
    function toTRBLCorners(value) {
        return _readValueToProps(value, ['topLeft', 'topRight', 'bottomLeft', 'bottomRight']);
    }
    function toPadding(value) {
        const obj = toTRBL(value);
        obj.width = obj.left + obj.right;
        obj.height = obj.top + obj.bottom;
        return obj;
    }
    function toFont(options, fallback) {
        options = options || {};
        fallback = fallback || defaults.font;
        let size = valueOrDefault(options.size, fallback.size);
        if (typeof size === 'string') {
            size = parseInt(size, 10);
        }
        let style = valueOrDefault(options.style, fallback.style);
        if (style && !('' + style).match(FONT_STYLE)) {
            console.warn('Invalid font style specified: "' + style + '"');
            style = '';
        }
        const font = {
            family: valueOrDefault(options.family, fallback.family),
            lineHeight: toLineHeight(valueOrDefault(options.lineHeight, fallback.lineHeight), size),
            size,
            style,
            weight: valueOrDefault(options.weight, fallback.weight),
            string: ''
        };
        font.string = toFontString(font);
        return font;
    }
    function resolve(inputs, context, index, info) {
        let cacheable = true;
        let i, ilen, value;
        for (i = 0, ilen = inputs.length; i < ilen; ++i) {
            value = inputs[i];
            if (value === undefined) {
                continue;
            }
            if (context !== undefined && typeof value === 'function') {
                value = value(context);
                cacheable = false;
            }
            if (index !== undefined && isArray(value)) {
                value = value[index % value.length];
                cacheable = false;
            }
            if (value !== undefined) {
                if (info && !cacheable) {
                    info.cacheable = false;
                }
                return value;
            }
        }
    }
    function _addGrace(minmax, grace, beginAtZero) {
        const {min, max} = minmax;
        const change = toDimension(grace, (max - min) / 2);
        const keepZero = (value, add) => beginAtZero && value === 0 ? 0 : value + add;
        return {
            min: keepZero(min, -Math.abs(change)),
            max: keepZero(max, change)
        };
    }
    function createContext(parentContext, context) {
        return Object.assign(Object.create(parentContext), context);
    }

    const getRightToLeftAdapter = function(rectX, width) {
        return {
            x(x) {
                return rectX + rectX + width - x;
            },
            setWidth(w) {
                width = w;
            },
            textAlign(align) {
                if (align === 'center') {
                    return align;
                }
                return align === 'right' ? 'left' : 'right';
            },
            xPlus(x, value) {
                return x - value;
            },
            leftForLtr(x, itemWidth) {
                return x - itemWidth;
            },
        };
    };
    const getLeftToRightAdapter = function() {
        return {
            x(x) {
                return x;
            },
            setWidth(w) {
            },
            textAlign(align) {
                return align;
            },
            xPlus(x, value) {
                return x + value;
            },
            leftForLtr(x, _itemWidth) {
                return x;
            },
        };
    };
    function getRtlAdapter(rtl, rectX, width) {
        return rtl ? getRightToLeftAdapter(rectX, width) : getLeftToRightAdapter();
    }
    function overrideTextDirection(ctx, direction) {
        let style, original;
        if (direction === 'ltr' || direction === 'rtl') {
            style = ctx.canvas.style;
            original = [
                style.getPropertyValue('direction'),
                style.getPropertyPriority('direction'),
            ];
            style.setProperty('direction', direction, 'important');
            ctx.prevTextDirection = original;
        }
    }
    function restoreTextDirection(ctx, original) {
        if (original !== undefined) {
            delete ctx.prevTextDirection;
            ctx.canvas.style.setProperty('direction', original[0], original[1]);
        }
    }

    function propertyFn(property) {
        if (property === 'angle') {
            return {
                between: _angleBetween,
                compare: _angleDiff,
                normalize: _normalizeAngle,
            };
        }
        return {
            between: _isBetween,
            compare: (a, b) => a - b,
            normalize: x => x
        };
    }
    function normalizeSegment({start, end, count, loop, style}) {
        return {
            start: start % count,
            end: end % count,
            loop: loop && (end - start + 1) % count === 0,
            style
        };
    }
    function getSegment(segment, points, bounds) {
        const {property, start: startBound, end: endBound} = bounds;
        const {between, normalize} = propertyFn(property);
        const count = points.length;
        let {start, end, loop} = segment;
        let i, ilen;
        if (loop) {
            start += count;
            end += count;
            for (i = 0, ilen = count; i < ilen; ++i) {
                if (!between(normalize(points[start % count][property]), startBound, endBound)) {
                    break;
                }
                start--;
                end--;
            }
            start %= count;
            end %= count;
        }
        if (end < start) {
            end += count;
        }
        return {start, end, loop, style: segment.style};
    }
    function _boundSegment(segment, points, bounds) {
        if (!bounds) {
            return [segment];
        }
        const {property, start: startBound, end: endBound} = bounds;
        const count = points.length;
        const {compare, between, normalize} = propertyFn(property);
        const {start, end, loop, style} = getSegment(segment, points, bounds);
        const result = [];
        let inside = false;
        let subStart = null;
        let value, point, prevValue;
        const startIsBefore = () => between(startBound, prevValue, value) && compare(startBound, prevValue) !== 0;
        const endIsBefore = () => compare(endBound, value) === 0 || between(endBound, prevValue, value);
        const shouldStart = () => inside || startIsBefore();
        const shouldStop = () => !inside || endIsBefore();
        for (let i = start, prev = start; i <= end; ++i) {
            point = points[i % count];
            if (point.skip) {
                continue;
            }
            value = normalize(point[property]);
            if (value === prevValue) {
                continue;
            }
            inside = between(value, startBound, endBound);
            if (subStart === null && shouldStart()) {
                subStart = compare(value, startBound) === 0 ? i : prev;
            }
            if (subStart !== null && shouldStop()) {
                result.push(normalizeSegment({start: subStart, end: i, loop, count, style}));
                subStart = null;
            }
            prev = i;
            prevValue = value;
        }
        if (subStart !== null) {
            result.push(normalizeSegment({start: subStart, end, loop, count, style}));
        }
        return result;
    }
    function _boundSegments(line, bounds) {
        const result = [];
        const segments = line.segments;
        for (let i = 0; i < segments.length; i++) {
            const sub = _boundSegment(segments[i], line.points, bounds);
            if (sub.length) {
                result.push(...sub);
            }
        }
        return result;
    }
    function findStartAndEnd(points, count, loop, spanGaps) {
        let start = 0;
        let end = count - 1;
        if (loop && !spanGaps) {
            while (start < count && !points[start].skip) {
                start++;
            }
        }
        while (start < count && points[start].skip) {
            start++;
        }
        start %= count;
        if (loop) {
            end += start;
        }
        while (end > start && points[end % count].skip) {
            end--;
        }
        end %= count;
        return {start, end};
    }
    function solidSegments(points, start, max, loop) {
        const count = points.length;
        const result = [];
        let last = start;
        let prev = points[start];
        let end;
        for (end = start + 1; end <= max; ++end) {
            const cur = points[end % count];
            if (cur.skip || cur.stop) {
                if (!prev.skip) {
                    loop = false;
                    result.push({start: start % count, end: (end - 1) % count, loop});
                    start = last = cur.stop ? end : null;
                }
            } else {
                last = end;
                if (prev.skip) {
                    start = end;
                }
            }
            prev = cur;
        }
        if (last !== null) {
            result.push({start: start % count, end: last % count, loop});
        }
        return result;
    }
    function _computeSegments(line, segmentOptions) {
        const points = line.points;
        const spanGaps = line.options.spanGaps;
        const count = points.length;
        if (!count) {
            return [];
        }
        const loop = !!line._loop;
        const {start, end} = findStartAndEnd(points, count, loop, spanGaps);
        if (spanGaps === true) {
            return splitByStyles(line, [{start, end, loop}], points, segmentOptions);
        }
        const max = end < start ? end + count : end;
        const completeLoop = !!line._fullLoop && start === 0 && end === count - 1;
        return splitByStyles(line, solidSegments(points, start, max, completeLoop), points, segmentOptions);
    }
    function splitByStyles(line, segments, points, segmentOptions) {
        if (!segmentOptions || !segmentOptions.setContext || !points) {
            return segments;
        }
        return doSplitByStyles(line, segments, points, segmentOptions);
    }
    function doSplitByStyles(line, segments, points, segmentOptions) {
        const chartContext = line._chart.getContext();
        const baseStyle = readStyle(line.options);
        const {_datasetIndex: datasetIndex, options: {spanGaps}} = line;
        const count = points.length;
        const result = [];
        let prevStyle = baseStyle;
        let start = segments[0].start;
        let i = start;
        function addStyle(s, e, l, st) {
            const dir = spanGaps ? -1 : 1;
            if (s === e) {
                return;
            }
            s += count;
            while (points[s % count].skip) {
                s -= dir;
            }
            while (points[e % count].skip) {
                e += dir;
            }
            if (s % count !== e % count) {
                result.push({start: s % count, end: e % count, loop: l, style: st});
                prevStyle = st;
                start = e % count;
            }
        }
        for (const segment of segments) {
            start = spanGaps ? start : segment.start;
            let prev = points[start % count];
            let style;
            for (i = start + 1; i <= segment.end; i++) {
                const pt = points[i % count];
                style = readStyle(segmentOptions.setContext(createContext(chartContext, {
                    type: 'segment',
                    p0: prev,
                    p1: pt,
                    p0DataIndex: (i - 1) % count,
                    p1DataIndex: i % count,
                    datasetIndex
                })));
                if (styleChanged(style, prevStyle)) {
                    addStyle(start, i - 1, segment.loop, prevStyle);
                }
                prev = pt;
                prevStyle = style;
            }
            if (start < i - 1) {
                addStyle(start, i - 1, segment.loop, prevStyle);
            }
        }
        return result;
    }
    function readStyle(options) {
        return {
            backgroundColor: options.backgroundColor,
            borderCapStyle: options.borderCapStyle,
            borderDash: options.borderDash,
            borderDashOffset: options.borderDashOffset,
            borderJoinStyle: options.borderJoinStyle,
            borderWidth: options.borderWidth,
            borderColor: options.borderColor
        };
    }
    function styleChanged(style, prevStyle) {
        return prevStyle && JSON.stringify(style) !== JSON.stringify(prevStyle);
    }

    var helpers = /*#__PURE__*/Object.freeze({
        __proto__: null,
        easingEffects: effects,
        isPatternOrGradient: isPatternOrGradient,
        color: color,
        getHoverColor: getHoverColor,
        noop: noop,
        uid: uid,
        isNullOrUndef: isNullOrUndef,
        isArray: isArray,
        isObject: isObject,
        isFinite: isNumberFinite,
        finiteOrDefault: finiteOrDefault,
        valueOrDefault: valueOrDefault,
        toPercentage: toPercentage,
        toDimension: toDimension,
        callback: callback,
        each: each,
        _elementsEqual: _elementsEqual,
        clone: clone$1,
        _merger: _merger,
        merge: merge,
        mergeIf: mergeIf,
        _mergerIf: _mergerIf,
        _deprecated: _deprecated,
        resolveObjectKey: resolveObjectKey,
        _splitKey: _splitKey,
        _capitalize: _capitalize,
        defined: defined,
        isFunction: isFunction,
        setsEqual: setsEqual,
        _isClickEvent: _isClickEvent,
        toFontString: toFontString,
        _measureText: _measureText,
        _longestText: _longestText,
        _alignPixel: _alignPixel,
        clearCanvas: clearCanvas,
        drawPoint: drawPoint,
        drawPointLegend: drawPointLegend,
        _isPointInArea: _isPointInArea,
        clipArea: clipArea,
        unclipArea: unclipArea,
        _steppedLineTo: _steppedLineTo,
        _bezierCurveTo: _bezierCurveTo,
        renderText: renderText,
        addRoundedRectPath: addRoundedRectPath,
        _lookup: _lookup,
        _lookupByKey: _lookupByKey,
        _rlookupByKey: _rlookupByKey,
        _filterBetween: _filterBetween,
        listenArrayEvents: listenArrayEvents,
        unlistenArrayEvents: unlistenArrayEvents,
        _arrayUnique: _arrayUnique,
        _createResolver: _createResolver,
        _attachContext: _attachContext,
        _descriptors: _descriptors,
        _parseObjectDataRadialScale: _parseObjectDataRadialScale,
        splineCurve: splineCurve,
        splineCurveMonotone: splineCurveMonotone,
        _updateBezierControlPoints: _updateBezierControlPoints,
        _isDomSupported: _isDomSupported,
        _getParentNode: _getParentNode,
        getStyle: getStyle,
        getRelativePosition: getRelativePosition,
        getMaximumSize: getMaximumSize,
        retinaScale: retinaScale,
        supportsEventListenerOptions: supportsEventListenerOptions,
        readUsedSize: readUsedSize,
        fontString: fontString,
        requestAnimFrame: requestAnimFrame,
        throttled: throttled,
        debounce: debounce,
        _toLeftRightCenter: _toLeftRightCenter,
        _alignStartEnd: _alignStartEnd,
        _textX: _textX,
        _getStartAndCountOfVisiblePoints: _getStartAndCountOfVisiblePoints,
        _scaleRangesChanged: _scaleRangesChanged,
        _pointInLine: _pointInLine,
        _steppedInterpolation: _steppedInterpolation,
        _bezierInterpolation: _bezierInterpolation,
        formatNumber: formatNumber,
        toLineHeight: toLineHeight,
        _readValueToProps: _readValueToProps,
        toTRBL: toTRBL,
        toTRBLCorners: toTRBLCorners,
        toPadding: toPadding,
        toFont: toFont,
        resolve: resolve,
        _addGrace: _addGrace,
        createContext: createContext,
        PI: PI,
        TAU: TAU,
        PITAU: PITAU,
        INFINITY: INFINITY,
        RAD_PER_DEG: RAD_PER_DEG,
        HALF_PI: HALF_PI,
        QUARTER_PI: QUARTER_PI,
        TWO_THIRDS_PI: TWO_THIRDS_PI,
        log10: log10,
        sign: sign,
        niceNum: niceNum,
        _factorize: _factorize,
        isNumber: isNumber,
        almostEquals: almostEquals,
        almostWhole: almostWhole,
        _setMinAndMaxByKey: _setMinAndMaxByKey,
        toRadians: toRadians,
        toDegrees: toDegrees,
        _decimalPlaces: _decimalPlaces,
        getAngleFromPoint: getAngleFromPoint,
        distanceBetweenPoints: distanceBetweenPoints,
        _angleDiff: _angleDiff,
        _normalizeAngle: _normalizeAngle,
        _angleBetween: _angleBetween,
        _limitValue: _limitValue,
        _int16Range: _int16Range,
        _isBetween: _isBetween,
        getRtlAdapter: getRtlAdapter,
        overrideTextDirection: overrideTextDirection,
        restoreTextDirection: restoreTextDirection,
        _boundSegment: _boundSegment,
        _boundSegments: _boundSegments,
        _computeSegments: _computeSegments
    });

    function binarySearch(metaset, axis, value, intersect) {
        const {controller, data, _sorted} = metaset;
        const iScale = controller._cachedMeta.iScale;
        if (iScale && axis === iScale.axis && axis !== 'r' && _sorted && data.length) {
            const lookupMethod = iScale._reversePixels ? _rlookupByKey : _lookupByKey;
            if (!intersect) {
                return lookupMethod(data, axis, value);
            } else if (controller._sharedOptions) {
                const el = data[0];
                const range = typeof el.getRange === 'function' && el.getRange(axis);
                if (range) {
                    const start = lookupMethod(data, axis, value - range);
                    const end = lookupMethod(data, axis, value + range);
                    return {lo: start.lo, hi: end.hi};
                }
            }
        }
        return {lo: 0, hi: data.length - 1};
    }
    function evaluateInteractionItems(chart, axis, position, handler, intersect) {
        const metasets = chart.getSortedVisibleDatasetMetas();
        const value = position[axis];
        for (let i = 0, ilen = metasets.length; i < ilen; ++i) {
            const {index, data} = metasets[i];
            const {lo, hi} = binarySearch(metasets[i], axis, value, intersect);
            for (let j = lo; j <= hi; ++j) {
                const element = data[j];
                if (!element.skip) {
                    handler(element, index, j);
                }
            }
        }
    }
    function getDistanceMetricForAxis(axis) {
        const useX = axis.indexOf('x') !== -1;
        const useY = axis.indexOf('y') !== -1;
        return function(pt1, pt2) {
            const deltaX = useX ? Math.abs(pt1.x - pt2.x) : 0;
            const deltaY = useY ? Math.abs(pt1.y - pt2.y) : 0;
            return Math.sqrt(Math.pow(deltaX, 2) + Math.pow(deltaY, 2));
        };
    }
    function getIntersectItems(chart, position, axis, useFinalPosition, includeInvisible) {
        const items = [];
        if (!includeInvisible && !chart.isPointInArea(position)) {
            return items;
        }
        const evaluationFunc = function(element, datasetIndex, index) {
            if (!includeInvisible && !_isPointInArea(element, chart.chartArea, 0)) {
                return;
            }
            if (element.inRange(position.x, position.y, useFinalPosition)) {
                items.push({element, datasetIndex, index});
            }
        };
        evaluateInteractionItems(chart, axis, position, evaluationFunc, true);
        return items;
    }
    function getNearestRadialItems(chart, position, axis, useFinalPosition) {
        let items = [];
        function evaluationFunc(element, datasetIndex, index) {
            const {startAngle, endAngle} = element.getProps(['startAngle', 'endAngle'], useFinalPosition);
            const {angle} = getAngleFromPoint(element, {x: position.x, y: position.y});
            if (_angleBetween(angle, startAngle, endAngle)) {
                items.push({element, datasetIndex, index});
            }
        }
        evaluateInteractionItems(chart, axis, position, evaluationFunc);
        return items;
    }
    function getNearestCartesianItems(chart, position, axis, intersect, useFinalPosition, includeInvisible) {
        let items = [];
        const distanceMetric = getDistanceMetricForAxis(axis);
        let minDistance = Number.POSITIVE_INFINITY;
        function evaluationFunc(element, datasetIndex, index) {
            const inRange = element.inRange(position.x, position.y, useFinalPosition);
            if (intersect && !inRange) {
                return;
            }
            const center = element.getCenterPoint(useFinalPosition);
            const pointInArea = !!includeInvisible || chart.isPointInArea(center);
            if (!pointInArea && !inRange) {
                return;
            }
            const distance = distanceMetric(position, center);
            if (distance < minDistance) {
                items = [{element, datasetIndex, index}];
                minDistance = distance;
            } else if (distance === minDistance) {
                items.push({element, datasetIndex, index});
            }
        }
        evaluateInteractionItems(chart, axis, position, evaluationFunc);
        return items;
    }
    function getNearestItems(chart, position, axis, intersect, useFinalPosition, includeInvisible) {
        if (!includeInvisible && !chart.isPointInArea(position)) {
            return [];
        }
        return axis === 'r' && !intersect
            ? getNearestRadialItems(chart, position, axis, useFinalPosition)
            : getNearestCartesianItems(chart, position, axis, intersect, useFinalPosition, includeInvisible);
    }
    function getAxisItems(chart, position, axis, intersect, useFinalPosition) {
        const items = [];
        const rangeMethod = axis === 'x' ? 'inXRange' : 'inYRange';
        let intersectsItem = false;
        evaluateInteractionItems(chart, axis, position, (element, datasetIndex, index) => {
            if (element[rangeMethod](position[axis], useFinalPosition)) {
                items.push({element, datasetIndex, index});
                intersectsItem = intersectsItem || element.inRange(position.x, position.y, useFinalPosition);
            }
        });
        if (intersect && !intersectsItem) {
            return [];
        }
        return items;
    }
    var Interaction = {
        evaluateInteractionItems,
        modes: {
            index(chart, e, options, useFinalPosition) {
                const position = getRelativePosition(e, chart);
                const axis = options.axis || 'x';
                const includeInvisible = options.includeInvisible || false;
                const items = options.intersect
                    ? getIntersectItems(chart, position, axis, useFinalPosition, includeInvisible)
                    : getNearestItems(chart, position, axis, false, useFinalPosition, includeInvisible);
                const elements = [];
                if (!items.length) {
                    return [];
                }
                chart.getSortedVisibleDatasetMetas().forEach((meta) => {
                    const index = items[0].index;
                    const element = meta.data[index];
                    if (element && !element.skip) {
                        elements.push({element, datasetIndex: meta.index, index});
                    }
                });
                return elements;
            },
            dataset(chart, e, options, useFinalPosition) {
                const position = getRelativePosition(e, chart);
                const axis = options.axis || 'xy';
                const includeInvisible = options.includeInvisible || false;
                let items = options.intersect
                    ? getIntersectItems(chart, position, axis, useFinalPosition, includeInvisible) :
                    getNearestItems(chart, position, axis, false, useFinalPosition, includeInvisible);
                if (items.length > 0) {
                    const datasetIndex = items[0].datasetIndex;
                    const data = chart.getDatasetMeta(datasetIndex).data;
                    items = [];
                    for (let i = 0; i < data.length; ++i) {
                        items.push({element: data[i], datasetIndex, index: i});
                    }
                }
                return items;
            },
            point(chart, e, options, useFinalPosition) {
                const position = getRelativePosition(e, chart);
                const axis = options.axis || 'xy';
                const includeInvisible = options.includeInvisible || false;
                return getIntersectItems(chart, position, axis, useFinalPosition, includeInvisible);
            },
            nearest(chart, e, options, useFinalPosition) {
                const position = getRelativePosition(e, chart);
                const axis = options.axis || 'xy';
                const includeInvisible = options.includeInvisible || false;
                return getNearestItems(chart, position, axis, options.intersect, useFinalPosition, includeInvisible);
            },
            x(chart, e, options, useFinalPosition) {
                const position = getRelativePosition(e, chart);
                return getAxisItems(chart, position, 'x', options.intersect, useFinalPosition);
            },
            y(chart, e, options, useFinalPosition) {
                const position = getRelativePosition(e, chart);
                return getAxisItems(chart, position, 'y', options.intersect, useFinalPosition);
            }
        }
    };

    const STATIC_POSITIONS = ['left', 'top', 'right', 'bottom'];
    function filterByPosition(array, position) {
        return array.filter(v => v.pos === position);
    }
    function filterDynamicPositionByAxis(array, axis) {
        return array.filter(v => STATIC_POSITIONS.indexOf(v.pos) === -1 && v.box.axis === axis);
    }
    function sortByWeight(array, reverse) {
        return array.sort((a, b) => {
            const v0 = reverse ? b : a;
            const v1 = reverse ? a : b;
            return v0.weight === v1.weight ?
                v0.index - v1.index :
                v0.weight - v1.weight;
        });
    }
    function wrapBoxes(boxes) {
        const layoutBoxes = [];
        let i, ilen, box, pos, stack, stackWeight;
        for (i = 0, ilen = (boxes || []).length; i < ilen; ++i) {
            box = boxes[i];
            ({position: pos, options: {stack, stackWeight = 1}} = box);
            layoutBoxes.push({
                index: i,
                box,
                pos,
                horizontal: box.isHorizontal(),
                weight: box.weight,
                stack: stack && (pos + stack),
                stackWeight
            });
        }
        return layoutBoxes;
    }
    function buildStacks(layouts) {
        const stacks = {};
        for (const wrap of layouts) {
            const {stack, pos, stackWeight} = wrap;
            if (!stack || !STATIC_POSITIONS.includes(pos)) {
                continue;
            }
            const _stack = stacks[stack] || (stacks[stack] = {count: 0, placed: 0, weight: 0, size: 0});
            _stack.count++;
            _stack.weight += stackWeight;
        }
        return stacks;
    }
    function setLayoutDims(layouts, params) {
        const stacks = buildStacks(layouts);
        const {vBoxMaxWidth, hBoxMaxHeight} = params;
        let i, ilen, layout;
        for (i = 0, ilen = layouts.length; i < ilen; ++i) {
            layout = layouts[i];
            const {fullSize} = layout.box;
            const stack = stacks[layout.stack];
            const factor = stack && layout.stackWeight / stack.weight;
            if (layout.horizontal) {
                layout.width = factor ? factor * vBoxMaxWidth : fullSize && params.availableWidth;
                layout.height = hBoxMaxHeight;
            } else {
                layout.width = vBoxMaxWidth;
                layout.height = factor ? factor * hBoxMaxHeight : fullSize && params.availableHeight;
            }
        }
        return stacks;
    }
    function buildLayoutBoxes(boxes) {
        const layoutBoxes = wrapBoxes(boxes);
        const fullSize = sortByWeight(layoutBoxes.filter(wrap => wrap.box.fullSize), true);
        const left = sortByWeight(filterByPosition(layoutBoxes, 'left'), true);
        const right = sortByWeight(filterByPosition(layoutBoxes, 'right'));
        const top = sortByWeight(filterByPosition(layoutBoxes, 'top'), true);
        const bottom = sortByWeight(filterByPosition(layoutBoxes, 'bottom'));
        const centerHorizontal = filterDynamicPositionByAxis(layoutBoxes, 'x');
        const centerVertical = filterDynamicPositionByAxis(layoutBoxes, 'y');
        return {
            fullSize,
            leftAndTop: left.concat(top),
            rightAndBottom: right.concat(centerVertical).concat(bottom).concat(centerHorizontal),
            chartArea: filterByPosition(layoutBoxes, 'chartArea'),
            vertical: left.concat(right).concat(centerVertical),
            horizontal: top.concat(bottom).concat(centerHorizontal)
        };
    }
    function getCombinedMax(maxPadding, chartArea, a, b) {
        return Math.max(maxPadding[a], chartArea[a]) + Math.max(maxPadding[b], chartArea[b]);
    }
    function updateMaxPadding(maxPadding, boxPadding) {
        maxPadding.top = Math.max(maxPadding.top, boxPadding.top);
        maxPadding.left = Math.max(maxPadding.left, boxPadding.left);
        maxPadding.bottom = Math.max(maxPadding.bottom, boxPadding.bottom);
        maxPadding.right = Math.max(maxPadding.right, boxPadding.right);
    }
    function updateDims(chartArea, params, layout, stacks) {
        const {pos, box} = layout;
        const maxPadding = chartArea.maxPadding;
        if (!isObject(pos)) {
            if (layout.size) {
                chartArea[pos] -= layout.size;
            }
            const stack = stacks[layout.stack] || {size: 0, count: 1};
            stack.size = Math.max(stack.size, layout.horizontal ? box.height : box.width);
            layout.size = stack.size / stack.count;
            chartArea[pos] += layout.size;
        }
        if (box.getPadding) {
            updateMaxPadding(maxPadding, box.getPadding());
        }
        const newWidth = Math.max(0, params.outerWidth - getCombinedMax(maxPadding, chartArea, 'left', 'right'));
        const newHeight = Math.max(0, params.outerHeight - getCombinedMax(maxPadding, chartArea, 'top', 'bottom'));
        const widthChanged = newWidth !== chartArea.w;
        const heightChanged = newHeight !== chartArea.h;
        chartArea.w = newWidth;
        chartArea.h = newHeight;
        return layout.horizontal
            ? {same: widthChanged, other: heightChanged}
            : {same: heightChanged, other: widthChanged};
    }
    function handleMaxPadding(chartArea) {
        const maxPadding = chartArea.maxPadding;
        function updatePos(pos) {
            const change = Math.max(maxPadding[pos] - chartArea[pos], 0);
            chartArea[pos] += change;
            return change;
        }
        chartArea.y += updatePos('top');
        chartArea.x += updatePos('left');
        updatePos('right');
        updatePos('bottom');
    }
    function getMargins(horizontal, chartArea) {
        const maxPadding = chartArea.maxPadding;
        function marginForPositions(positions) {
            const margin = {left: 0, top: 0, right: 0, bottom: 0};
            positions.forEach((pos) => {
                margin[pos] = Math.max(chartArea[pos], maxPadding[pos]);
            });
            return margin;
        }
        return horizontal
            ? marginForPositions(['left', 'right'])
            : marginForPositions(['top', 'bottom']);
    }
    function fitBoxes(boxes, chartArea, params, stacks) {
        const refitBoxes = [];
        let i, ilen, layout, box, refit, changed;
        for (i = 0, ilen = boxes.length, refit = 0; i < ilen; ++i) {
            layout = boxes[i];
            box = layout.box;
            box.update(
                layout.width || chartArea.w,
                layout.height || chartArea.h,
                getMargins(layout.horizontal, chartArea)
            );
            const {same, other} = updateDims(chartArea, params, layout, stacks);
            refit |= same && refitBoxes.length;
            changed = changed || other;
            if (!box.fullSize) {
                refitBoxes.push(layout);
            }
        }
        return refit && fitBoxes(refitBoxes, chartArea, params, stacks) || changed;
    }
    function setBoxDims(box, left, top, width, height) {
        box.top = top;
        box.left = left;
        box.right = left + width;
        box.bottom = top + height;
        box.width = width;
        box.height = height;
    }
    function placeBoxes(boxes, chartArea, params, stacks) {
        const userPadding = params.padding;
        let {x, y} = chartArea;
        for (const layout of boxes) {
            const box = layout.box;
            const stack = stacks[layout.stack] || {count: 1, placed: 0, weight: 1};
            const weight = (layout.stackWeight / stack.weight) || 1;
            if (layout.horizontal) {
                const width = chartArea.w * weight;
                const height = stack.size || box.height;
                if (defined(stack.start)) {
                    y = stack.start;
                }
                if (box.fullSize) {
                    setBoxDims(box, userPadding.left, y, params.outerWidth - userPadding.right - userPadding.left, height);
                } else {
                    setBoxDims(box, chartArea.left + stack.placed, y, width, height);
                }
                stack.start = y;
                stack.placed += width;
                y = box.bottom;
            } else {
                const height = chartArea.h * weight;
                const width = stack.size || box.width;
                if (defined(stack.start)) {
                    x = stack.start;
                }
                if (box.fullSize) {
                    setBoxDims(box, x, userPadding.top, width, params.outerHeight - userPadding.bottom - userPadding.top);
                } else {
                    setBoxDims(box, x, chartArea.top + stack.placed, width, height);
                }
                stack.start = x;
                stack.placed += height;
                x = box.right;
            }
        }
        chartArea.x = x;
        chartArea.y = y;
    }
    defaults.set('layout', {
        autoPadding: true,
        padding: {
            top: 0,
            right: 0,
            bottom: 0,
            left: 0
        }
    });
    var layouts = {
        addBox(chart, item) {
            if (!chart.boxes) {
                chart.boxes = [];
            }
            item.fullSize = item.fullSize || false;
            item.position = item.position || 'top';
            item.weight = item.weight || 0;
            item._layers = item._layers || function() {
                return [{
                    z: 0,
                    draw(chartArea) {
                        item.draw(chartArea);
                    }
                }];
            };
            chart.boxes.push(item);
        },
        removeBox(chart, layoutItem) {
            const index = chart.boxes ? chart.boxes.indexOf(layoutItem) : -1;
            if (index !== -1) {
                chart.boxes.splice(index, 1);
            }
        },
        configure(chart, item, options) {
            item.fullSize = options.fullSize;
            item.position = options.position;
            item.weight = options.weight;
        },
        update(chart, width, height, minPadding) {
            if (!chart) {
                return;
            }
            const padding = toPadding(chart.options.layout.padding);
            const availableWidth = Math.max(width - padding.width, 0);
            const availableHeight = Math.max(height - padding.height, 0);
            const boxes = buildLayoutBoxes(chart.boxes);
            const verticalBoxes = boxes.vertical;
            const horizontalBoxes = boxes.horizontal;
            each(chart.boxes, box => {
                if (typeof box.beforeLayout === 'function') {
                    box.beforeLayout();
                }
            });
            const visibleVerticalBoxCount = verticalBoxes.reduce((total, wrap) =>
                wrap.box.options && wrap.box.options.display === false ? total : total + 1, 0) || 1;
            const params = Object.freeze({
                outerWidth: width,
                outerHeight: height,
                padding,
                availableWidth,
                availableHeight,
                vBoxMaxWidth: availableWidth / 2 / visibleVerticalBoxCount,
                hBoxMaxHeight: availableHeight / 2
            });
            const maxPadding = Object.assign({}, padding);
            updateMaxPadding(maxPadding, toPadding(minPadding));
            const chartArea = Object.assign({
                maxPadding,
                w: availableWidth,
                h: availableHeight,
                x: padding.left,
                y: padding.top
            }, padding);
            const stacks = setLayoutDims(verticalBoxes.concat(horizontalBoxes), params);
            fitBoxes(boxes.fullSize, chartArea, params, stacks);
            fitBoxes(verticalBoxes, chartArea, params, stacks);
            if (fitBoxes(horizontalBoxes, chartArea, params, stacks)) {
                fitBoxes(verticalBoxes, chartArea, params, stacks);
            }
            handleMaxPadding(chartArea);
            placeBoxes(boxes.leftAndTop, chartArea, params, stacks);
            chartArea.x += chartArea.w;
            chartArea.y += chartArea.h;
            placeBoxes(boxes.rightAndBottom, chartArea, params, stacks);
            chart.chartArea = {
                left: chartArea.left,
                top: chartArea.top,
                right: chartArea.left + chartArea.w,
                bottom: chartArea.top + chartArea.h,
                height: chartArea.h,
                width: chartArea.w,
            };
            each(boxes.chartArea, (layout) => {
                const box = layout.box;
                Object.assign(box, chart.chartArea);
                box.update(chartArea.w, chartArea.h, {left: 0, top: 0, right: 0, bottom: 0});
            });
        }
    };

    class BasePlatform {
        acquireContext(canvas, aspectRatio) {}
        releaseContext(context) {
            return false;
        }
        addEventListener(chart, type, listener) {}
        removeEventListener(chart, type, listener) {}
        getDevicePixelRatio() {
            return 1;
        }
        getMaximumSize(element, width, height, aspectRatio) {
            width = Math.max(0, width || element.width);
            height = height || element.height;
            return {
                width,
                height: Math.max(0, aspectRatio ? Math.floor(width / aspectRatio) : height)
            };
        }
        isAttached(canvas) {
            return true;
        }
        updateConfig(config) {
        }
    }

    class BasicPlatform extends BasePlatform {
        acquireContext(item) {
            return item && item.getContext && item.getContext('2d') || null;
        }
        updateConfig(config) {
            config.options.animation = false;
        }
    }

    const EXPANDO_KEY = '$chartjs';
    const EVENT_TYPES = {
        touchstart: 'mousedown',
        touchmove: 'mousemove',
        touchend: 'mouseup',
        pointerenter: 'mouseenter',
        pointerdown: 'mousedown',
        pointermove: 'mousemove',
        pointerup: 'mouseup',
        pointerleave: 'mouseout',
        pointerout: 'mouseout'
    };
    const isNullOrEmpty = value => value === null || value === '';
    function initCanvas(canvas, aspectRatio) {
        const style = canvas.style;
        const renderHeight = canvas.getAttribute('height');
        const renderWidth = canvas.getAttribute('width');
        canvas[EXPANDO_KEY] = {
            initial: {
                height: renderHeight,
                width: renderWidth,
                style: {
                    display: style.display,
                    height: style.height,
                    width: style.width
                }
            }
        };
        style.display = style.display || 'block';
        style.boxSizing = style.boxSizing || 'border-box';
        if (isNullOrEmpty(renderWidth)) {
            const displayWidth = readUsedSize(canvas, 'width');
            if (displayWidth !== undefined) {
                canvas.width = displayWidth;
            }
        }
        if (isNullOrEmpty(renderHeight)) {
            if (canvas.style.height === '') {
                canvas.height = canvas.width / (aspectRatio || 2);
            } else {
                const displayHeight = readUsedSize(canvas, 'height');
                if (displayHeight !== undefined) {
                    canvas.height = displayHeight;
                }
            }
        }
        return canvas;
    }
    const eventListenerOptions = supportsEventListenerOptions ? {passive: true} : false;
    function addListener(node, type, listener) {
        node.addEventListener(type, listener, eventListenerOptions);
    }
    function removeListener(chart, type, listener) {
        chart.canvas.removeEventListener(type, listener, eventListenerOptions);
    }
    function fromNativeEvent(event, chart) {
        const type = EVENT_TYPES[event.type] || event.type;
        const {x, y} = getRelativePosition(event, chart);
        return {
            type,
            chart,
            native: event,
            x: x !== undefined ? x : null,
            y: y !== undefined ? y : null,
        };
    }
    function nodeListContains(nodeList, canvas) {
        for (const node of nodeList) {
            if (node === canvas || node.contains(canvas)) {
                return true;
            }
        }
    }
    function createAttachObserver(chart, type, listener) {
        const canvas = chart.canvas;
        const observer = new MutationObserver(entries => {
            let trigger = false;
            for (const entry of entries) {
                trigger = trigger || nodeListContains(entry.addedNodes, canvas);
                trigger = trigger && !nodeListContains(entry.removedNodes, canvas);
            }
            if (trigger) {
                listener();
            }
        });
        observer.observe(document, {childList: true, subtree: true});
        return observer;
    }
    function createDetachObserver(chart, type, listener) {
        const canvas = chart.canvas;
        const observer = new MutationObserver(entries => {
            let trigger = false;
            for (const entry of entries) {
                trigger = trigger || nodeListContains(entry.removedNodes, canvas);
                trigger = trigger && !nodeListContains(entry.addedNodes, canvas);
            }
            if (trigger) {
                listener();
            }
        });
        observer.observe(document, {childList: true, subtree: true});
        return observer;
    }
    const drpListeningCharts = new Map();
    let oldDevicePixelRatio = 0;
    function onWindowResize() {
        const dpr = window.devicePixelRatio;
        if (dpr === oldDevicePixelRatio) {
            return;
        }
        oldDevicePixelRatio = dpr;
        drpListeningCharts.forEach((resize, chart) => {
            if (chart.currentDevicePixelRatio !== dpr) {
                resize();
            }
        });
    }
    function listenDevicePixelRatioChanges(chart, resize) {
        if (!drpListeningCharts.size) {
            window.addEventListener('resize', onWindowResize);
        }
        drpListeningCharts.set(chart, resize);
    }
    function unlistenDevicePixelRatioChanges(chart) {
        drpListeningCharts.delete(chart);
        if (!drpListeningCharts.size) {
            window.removeEventListener('resize', onWindowResize);
        }
    }
    function createResizeObserver(chart, type, listener) {
        const canvas = chart.canvas;
        const container = canvas && _getParentNode(canvas);
        if (!container) {
            return;
        }
        const resize = throttled((width, height) => {
            const w = container.clientWidth;
            listener(width, height);
            if (w < container.clientWidth) {
                listener();
            }
        }, window);
        const observer = new ResizeObserver(entries => {
            const entry = entries[0];
            const width = entry.contentRect.width;
            const height = entry.contentRect.height;
            if (width === 0 && height === 0) {
                return;
            }
            resize(width, height);
        });
        observer.observe(container);
        listenDevicePixelRatioChanges(chart, resize);
        return observer;
    }
    function releaseObserver(chart, type, observer) {
        if (observer) {
            observer.disconnect();
        }
        if (type === 'resize') {
            unlistenDevicePixelRatioChanges(chart);
        }
    }
    function createProxyAndListen(chart, type, listener) {
        const canvas = chart.canvas;
        const proxy = throttled((event) => {
            if (chart.ctx !== null) {
                listener(fromNativeEvent(event, chart));
            }
        }, chart, (args) => {
            const event = args[0];
            return [event, event.offsetX, event.offsetY];
        });
        addListener(canvas, type, proxy);
        return proxy;
    }
    class DomPlatform extends BasePlatform {
        acquireContext(canvas, aspectRatio) {
            const context = canvas && canvas.getContext && canvas.getContext('2d');
            if (context && context.canvas === canvas) {
                initCanvas(canvas, aspectRatio);
                return context;
            }
            return null;
        }
        releaseContext(context) {
            const canvas = context.canvas;
            if (!canvas[EXPANDO_KEY]) {
                return false;
            }
            const initial = canvas[EXPANDO_KEY].initial;
            ['height', 'width'].forEach((prop) => {
                const value = initial[prop];
                if (isNullOrUndef(value)) {
                    canvas.removeAttribute(prop);
                } else {
                    canvas.setAttribute(prop, value);
                }
            });
            const style = initial.style || {};
            Object.keys(style).forEach((key) => {
                canvas.style[key] = style[key];
            });
            canvas.width = canvas.width;
            delete canvas[EXPANDO_KEY];
            return true;
        }
        addEventListener(chart, type, listener) {
            this.removeEventListener(chart, type);
            const proxies = chart.$proxies || (chart.$proxies = {});
            const handlers = {
                attach: createAttachObserver,
                detach: createDetachObserver,
                resize: createResizeObserver
            };
            const handler = handlers[type] || createProxyAndListen;
            proxies[type] = handler(chart, type, listener);
        }
        removeEventListener(chart, type) {
            const proxies = chart.$proxies || (chart.$proxies = {});
            const proxy = proxies[type];
            if (!proxy) {
                return;
            }
            const handlers = {
                attach: releaseObserver,
                detach: releaseObserver,
                resize: releaseObserver
            };
            const handler = handlers[type] || removeListener;
            handler(chart, type, proxy);
            proxies[type] = undefined;
        }
        getDevicePixelRatio() {
            return window.devicePixelRatio;
        }
        getMaximumSize(canvas, width, height, aspectRatio) {
            return getMaximumSize(canvas, width, height, aspectRatio);
        }
        isAttached(canvas) {
            const container = _getParentNode(canvas);
            return !!(container && container.isConnected);
        }
    }

    function _detectPlatform(canvas) {
        if (!_isDomSupported() || (typeof OffscreenCanvas !== 'undefined' && canvas instanceof OffscreenCanvas)) {
            return BasicPlatform;
        }
        return DomPlatform;
    }

    var platforms = /*#__PURE__*/Object.freeze({
        __proto__: null,
        _detectPlatform: _detectPlatform,
        BasePlatform: BasePlatform,
        BasicPlatform: BasicPlatform,
        DomPlatform: DomPlatform
    });

    const transparent = 'transparent';
    const interpolators = {
        boolean(from, to, factor) {
            return factor > 0.5 ? to : from;
        },
        color(from, to, factor) {
            const c0 = color(from || transparent);
            const c1 = c0.valid && color(to || transparent);
            return c1 && c1.valid
                ? c1.mix(c0, factor).hexString()
                : to;
        },
        number(from, to, factor) {
            return from + (to - from) * factor;
        }
    };
    class Animation {
        constructor(cfg, target, prop, to) {
            const currentValue = target[prop];
            to = resolve([cfg.to, to, currentValue, cfg.from]);
            const from = resolve([cfg.from, currentValue, to]);
            this._active = true;
            this._fn = cfg.fn || interpolators[cfg.type || typeof from];
            this._easing = effects[cfg.easing] || effects.linear;
            this._start = Math.floor(Date.now() + (cfg.delay || 0));
            this._duration = this._total = Math.floor(cfg.duration);
            this._loop = !!cfg.loop;
            this._target = target;
            this._prop = prop;
            this._from = from;
            this._to = to;
            this._promises = undefined;
        }
        active() {
            return this._active;
        }
        update(cfg, to, date) {
            if (this._active) {
                this._notify(false);
                const currentValue = this._target[this._prop];
                const elapsed = date - this._start;
                const remain = this._duration - elapsed;
                this._start = date;
                this._duration = Math.floor(Math.max(remain, cfg.duration));
                this._total += elapsed;
                this._loop = !!cfg.loop;
                this._to = resolve([cfg.to, to, currentValue, cfg.from]);
                this._from = resolve([cfg.from, currentValue, to]);
            }
        }
        cancel() {
            if (this._active) {
                this.tick(Date.now());
                this._active = false;
                this._notify(false);
            }
        }
        tick(date) {
            const elapsed = date - this._start;
            const duration = this._duration;
            const prop = this._prop;
            const from = this._from;
            const loop = this._loop;
            const to = this._to;
            let factor;
            this._active = from !== to && (loop || (elapsed < duration));
            if (!this._active) {
                this._target[prop] = to;
                this._notify(true);
                return;
            }
            if (elapsed < 0) {
                this._target[prop] = from;
                return;
            }
            factor = (elapsed / duration) % 2;
            factor = loop && factor > 1 ? 2 - factor : factor;
            factor = this._easing(Math.min(1, Math.max(0, factor)));
            this._target[prop] = this._fn(from, to, factor);
        }
        wait() {
            const promises = this._promises || (this._promises = []);
            return new Promise((res, rej) => {
                promises.push({res, rej});
            });
        }
        _notify(resolved) {
            const method = resolved ? 'res' : 'rej';
            const promises = this._promises || [];
            for (let i = 0; i < promises.length; i++) {
                promises[i][method]();
            }
        }
    }

    const numbers = ['x', 'y', 'borderWidth', 'radius', 'tension'];
    const colors = ['color', 'borderColor', 'backgroundColor'];
    defaults.set('animation', {
        delay: undefined,
        duration: 1000,
        easing: 'easeOutQuart',
        fn: undefined,
        from: undefined,
        loop: undefined,
        to: undefined,
        type: undefined,
    });
    const animationOptions = Object.keys(defaults.animation);
    defaults.describe('animation', {
        _fallback: false,
        _indexable: false,
        _scriptable: (name) => name !== 'onProgress' && name !== 'onComplete' && name !== 'fn',
    });
    defaults.set('animations', {
        colors: {
            type: 'color',
            properties: colors
        },
        numbers: {
            type: 'number',
            properties: numbers
        },
    });
    defaults.describe('animations', {
        _fallback: 'animation',
    });
    defaults.set('transitions', {
        active: {
            animation: {
                duration: 400
            }
        },
        resize: {
            animation: {
                duration: 0
            }
        },
        show: {
            animations: {
                colors: {
                    from: 'transparent'
                },
                visible: {
                    type: 'boolean',
                    duration: 0
                },
            }
        },
        hide: {
            animations: {
                colors: {
                    to: 'transparent'
                },
                visible: {
                    type: 'boolean',
                    easing: 'linear',
                    fn: v => v | 0
                },
            }
        }
    });
    class Animations {
        constructor(chart, config) {
            this._chart = chart;
            this._properties = new Map();
            this.configure(config);
        }
        configure(config) {
            if (!isObject(config)) {
                return;
            }
            const animatedProps = this._properties;
            Object.getOwnPropertyNames(config).forEach(key => {
                const cfg = config[key];
                if (!isObject(cfg)) {
                    return;
                }
                const resolved = {};
                for (const option of animationOptions) {
                    resolved[option] = cfg[option];
                }
                (isArray(cfg.properties) && cfg.properties || [key]).forEach((prop) => {
                    if (prop === key || !animatedProps.has(prop)) {
                        animatedProps.set(prop, resolved);
                    }
                });
            });
        }
        _animateOptions(target, values) {
            const newOptions = values.options;
            const options = resolveTargetOptions(target, newOptions);
            if (!options) {
                return [];
            }
            const animations = this._createAnimations(options, newOptions);
            if (newOptions.$shared) {
                awaitAll(target.options.$animations, newOptions).then(() => {
                    target.options = newOptions;
                }, () => {
                });
            }
            return animations;
        }
        _createAnimations(target, values) {
            const animatedProps = this._properties;
            const animations = [];
            const running = target.$animations || (target.$animations = {});
            const props = Object.keys(values);
            const date = Date.now();
            let i;
            for (i = props.length - 1; i >= 0; --i) {
                const prop = props[i];
                if (prop.charAt(0) === '$') {
                    continue;
                }
                if (prop === 'options') {
                    animations.push(...this._animateOptions(target, values));
                    continue;
                }
                const value = values[prop];
                let animation = running[prop];
                const cfg = animatedProps.get(prop);
                if (animation) {
                    if (cfg && animation.active()) {
                        animation.update(cfg, value, date);
                        continue;
                    } else {
                        animation.cancel();
                    }
                }
                if (!cfg || !cfg.duration) {
                    target[prop] = value;
                    continue;
                }
                running[prop] = animation = new Animation(cfg, target, prop, value);
                animations.push(animation);
            }
            return animations;
        }
        update(target, values) {
            if (this._properties.size === 0) {
                Object.assign(target, values);
                return;
            }
            const animations = this._createAnimations(target, values);
            if (animations.length) {
                animator.add(this._chart, animations);
                return true;
            }
        }
    }
    function awaitAll(animations, properties) {
        const running = [];
        const keys = Object.keys(properties);
        for (let i = 0; i < keys.length; i++) {
            const anim = animations[keys[i]];
            if (anim && anim.active()) {
                running.push(anim.wait());
            }
        }
        return Promise.all(running);
    }
    function resolveTargetOptions(target, newOptions) {
        if (!newOptions) {
            return;
        }
        let options = target.options;
        if (!options) {
            target.options = newOptions;
            return;
        }
        if (options.$shared) {
            target.options = options = Object.assign({}, options, {$shared: false, $animations: {}});
        }
        return options;
    }

    function scaleClip(scale, allowedOverflow) {
        const opts = scale && scale.options || {};
        const reverse = opts.reverse;
        const min = opts.min === undefined ? allowedOverflow : 0;
        const max = opts.max === undefined ? allowedOverflow : 0;
        return {
            start: reverse ? max : min,
            end: reverse ? min : max
        };
    }
    function defaultClip(xScale, yScale, allowedOverflow) {
        if (allowedOverflow === false) {
            return false;
        }
        const x = scaleClip(xScale, allowedOverflow);
        const y = scaleClip(yScale, allowedOverflow);
        return {
            top: y.end,
            right: x.end,
            bottom: y.start,
            left: x.start
        };
    }
    function toClip(value) {
        let t, r, b, l;
        if (isObject(value)) {
            t = value.top;
            r = value.right;
            b = value.bottom;
            l = value.left;
        } else {
            t = r = b = l = value;
        }
        return {
            top: t,
            right: r,
            bottom: b,
            left: l,
            disabled: value === false
        };
    }
    function getSortedDatasetIndices(chart, filterVisible) {
        const keys = [];
        const metasets = chart._getSortedDatasetMetas(filterVisible);
        let i, ilen;
        for (i = 0, ilen = metasets.length; i < ilen; ++i) {
            keys.push(metasets[i].index);
        }
        return keys;
    }
    function applyStack(stack, value, dsIndex, options = {}) {
        const keys = stack.keys;
        const singleMode = options.mode === 'single';
        let i, ilen, datasetIndex, otherValue;
        if (value === null) {
            return;
        }
        for (i = 0, ilen = keys.length; i < ilen; ++i) {
            datasetIndex = +keys[i];
            if (datasetIndex === dsIndex) {
                if (options.all) {
                    continue;
                }
                break;
            }
            otherValue = stack.values[datasetIndex];
            if (isNumberFinite(otherValue) && (singleMode || (value === 0 || sign(value) === sign(otherValue)))) {
                value += otherValue;
            }
        }
        return value;
    }
    function convertObjectDataToArray(data) {
        const keys = Object.keys(data);
        const adata = new Array(keys.length);
        let i, ilen, key;
        for (i = 0, ilen = keys.length; i < ilen; ++i) {
            key = keys[i];
            adata[i] = {
                x: key,
                y: data[key]
            };
        }
        return adata;
    }
    function isStacked(scale, meta) {
        const stacked = scale && scale.options.stacked;
        return stacked || (stacked === undefined && meta.stack !== undefined);
    }
    function getStackKey(indexScale, valueScale, meta) {
        return `${indexScale.id}.${valueScale.id}.${meta.stack || meta.type}`;
    }
    function getUserBounds(scale) {
        const {min, max, minDefined, maxDefined} = scale.getUserBounds();
        return {
            min: minDefined ? min : Number.NEGATIVE_INFINITY,
            max: maxDefined ? max : Number.POSITIVE_INFINITY
        };
    }
    function getOrCreateStack(stacks, stackKey, indexValue) {
        const subStack = stacks[stackKey] || (stacks[stackKey] = {});
        return subStack[indexValue] || (subStack[indexValue] = {});
    }
    function getLastIndexInStack(stack, vScale, positive, type) {
        for (const meta of vScale.getMatchingVisibleMetas(type).reverse()) {
            const value = stack[meta.index];
            if ((positive && value > 0) || (!positive && value < 0)) {
                return meta.index;
            }
        }
        return null;
    }
    function updateStacks(controller, parsed) {
        const {chart, _cachedMeta: meta} = controller;
        const stacks = chart._stacks || (chart._stacks = {});
        const {iScale, vScale, index: datasetIndex} = meta;
        const iAxis = iScale.axis;
        const vAxis = vScale.axis;
        const key = getStackKey(iScale, vScale, meta);
        const ilen = parsed.length;
        let stack;
        for (let i = 0; i < ilen; ++i) {
            const item = parsed[i];
            const {[iAxis]: index, [vAxis]: value} = item;
            const itemStacks = item._stacks || (item._stacks = {});
            stack = itemStacks[vAxis] = getOrCreateStack(stacks, key, index);
            stack[datasetIndex] = value;
            stack._top = getLastIndexInStack(stack, vScale, true, meta.type);
            stack._bottom = getLastIndexInStack(stack, vScale, false, meta.type);
        }
    }
    function getFirstScaleId(chart, axis) {
        const scales = chart.scales;
        return Object.keys(scales).filter(key => scales[key].axis === axis).shift();
    }
    function createDatasetContext(parent, index) {
        return createContext(parent,
            {
                active: false,
                dataset: undefined,
                datasetIndex: index,
                index,
                mode: 'default',
                type: 'dataset'
            }
        );
    }
    function createDataContext(parent, index, element) {
        return createContext(parent, {
            active: false,
            dataIndex: index,
            parsed: undefined,
            raw: undefined,
            element,
            index,
            mode: 'default',
            type: 'data'
        });
    }
    function clearStacks(meta, items) {
        const datasetIndex = meta.controller.index;
        const axis = meta.vScale && meta.vScale.axis;
        if (!axis) {
            return;
        }
        items = items || meta._parsed;
        for (const parsed of items) {
            const stacks = parsed._stacks;
            if (!stacks || stacks[axis] === undefined || stacks[axis][datasetIndex] === undefined) {
                return;
            }
            delete stacks[axis][datasetIndex];
        }
    }
    const isDirectUpdateMode = (mode) => mode === 'reset' || mode === 'none';
    const cloneIfNotShared = (cached, shared) => shared ? cached : Object.assign({}, cached);
    const createStack = (canStack, meta, chart) => canStack && !meta.hidden && meta._stacked
        && {keys: getSortedDatasetIndices(chart, true), values: null};
    class DatasetController {
        constructor(chart, datasetIndex) {
            this.chart = chart;
            this._ctx = chart.ctx;
            this.index = datasetIndex;
            this._cachedDataOpts = {};
            this._cachedMeta = this.getMeta();
            this._type = this._cachedMeta.type;
            this.options = undefined;
            this._parsing = false;
            this._data = undefined;
            this._objectData = undefined;
            this._sharedOptions = undefined;
            this._drawStart = undefined;
            this._drawCount = undefined;
            this.enableOptionSharing = false;
            this.supportsDecimation = false;
            this.$context = undefined;
            this._syncList = [];
            this.initialize();
        }
        initialize() {
            const meta = this._cachedMeta;
            this.configure();
            this.linkScales();
            meta._stacked = isStacked(meta.vScale, meta);
            this.addElements();
        }
        updateIndex(datasetIndex) {
            if (this.index !== datasetIndex) {
                clearStacks(this._cachedMeta);
            }
            this.index = datasetIndex;
        }
        linkScales() {
            const chart = this.chart;
            const meta = this._cachedMeta;
            const dataset = this.getDataset();
            const chooseId = (axis, x, y, r) => axis === 'x' ? x : axis === 'r' ? r : y;
            const xid = meta.xAxisID = valueOrDefault(dataset.xAxisID, getFirstScaleId(chart, 'x'));
            const yid = meta.yAxisID = valueOrDefault(dataset.yAxisID, getFirstScaleId(chart, 'y'));
            const rid = meta.rAxisID = valueOrDefault(dataset.rAxisID, getFirstScaleId(chart, 'r'));
            const indexAxis = meta.indexAxis;
            const iid = meta.iAxisID = chooseId(indexAxis, xid, yid, rid);
            const vid = meta.vAxisID = chooseId(indexAxis, yid, xid, rid);
            meta.xScale = this.getScaleForId(xid);
            meta.yScale = this.getScaleForId(yid);
            meta.rScale = this.getScaleForId(rid);
            meta.iScale = this.getScaleForId(iid);
            meta.vScale = this.getScaleForId(vid);
        }
        getDataset() {
            return this.chart.data.datasets[this.index];
        }
        getMeta() {
            return this.chart.getDatasetMeta(this.index);
        }
        getScaleForId(scaleID) {
            return this.chart.scales[scaleID];
        }
        _getOtherScale(scale) {
            const meta = this._cachedMeta;
            return scale === meta.iScale
                ? meta.vScale
                : meta.iScale;
        }
        reset() {
            this._update('reset');
        }
        _destroy() {
            const meta = this._cachedMeta;
            if (this._data) {
                unlistenArrayEvents(this._data, this);
            }
            if (meta._stacked) {
                clearStacks(meta);
            }
        }
        _dataCheck() {
            const dataset = this.getDataset();
            const data = dataset.data || (dataset.data = []);
            const _data = this._data;
            if (isObject(data)) {
                this._data = convertObjectDataToArray(data);
            } else if (_data !== data) {
                if (_data) {
                    unlistenArrayEvents(_data, this);
                    const meta = this._cachedMeta;
                    clearStacks(meta);
                    meta._parsed = [];
                }
                if (data && Object.isExtensible(data)) {
                    listenArrayEvents(data, this);
                }
                this._syncList = [];
                this._data = data;
            }
        }
        addElements() {
            const meta = this._cachedMeta;
            this._dataCheck();
            if (this.datasetElementType) {
                meta.dataset = new this.datasetElementType();
            }
        }
        buildOrUpdateElements(resetNewElements) {
            const meta = this._cachedMeta;
            const dataset = this.getDataset();
            let stackChanged = false;
            this._dataCheck();
            const oldStacked = meta._stacked;
            meta._stacked = isStacked(meta.vScale, meta);
            if (meta.stack !== dataset.stack) {
                stackChanged = true;
                clearStacks(meta);
                meta.stack = dataset.stack;
            }
            this._resyncElements(resetNewElements);
            if (stackChanged || oldStacked !== meta._stacked) {
                updateStacks(this, meta._parsed);
            }
        }
        configure() {
            const config = this.chart.config;
            const scopeKeys = config.datasetScopeKeys(this._type);
            const scopes = config.getOptionScopes(this.getDataset(), scopeKeys, true);
            this.options = config.createResolver(scopes, this.getContext());
            this._parsing = this.options.parsing;
            this._cachedDataOpts = {};
        }
        parse(start, count) {
            const {_cachedMeta: meta, _data: data} = this;
            const {iScale, _stacked} = meta;
            const iAxis = iScale.axis;
            let sorted = start === 0 && count === data.length ? true : meta._sorted;
            let prev = start > 0 && meta._parsed[start - 1];
            let i, cur, parsed;
            if (this._parsing === false) {
                meta._parsed = data;
                meta._sorted = true;
                parsed = data;
            } else {
                if (isArray(data[start])) {
                    parsed = this.parseArrayData(meta, data, start, count);
                } else if (isObject(data[start])) {
                    parsed = this.parseObjectData(meta, data, start, count);
                } else {
                    parsed = this.parsePrimitiveData(meta, data, start, count);
                }
                const isNotInOrderComparedToPrev = () => cur[iAxis] === null || (prev && cur[iAxis] < prev[iAxis]);
                for (i = 0; i < count; ++i) {
                    meta._parsed[i + start] = cur = parsed[i];
                    if (sorted) {
                        if (isNotInOrderComparedToPrev()) {
                            sorted = false;
                        }
                        prev = cur;
                    }
                }
                meta._sorted = sorted;
            }
            if (_stacked) {
                updateStacks(this, parsed);
            }
        }
        parsePrimitiveData(meta, data, start, count) {
            const {iScale, vScale} = meta;
            const iAxis = iScale.axis;
            const vAxis = vScale.axis;
            const labels = iScale.getLabels();
            const singleScale = iScale === vScale;
            const parsed = new Array(count);
            let i, ilen, index;
            for (i = 0, ilen = count; i < ilen; ++i) {
                index = i + start;
                parsed[i] = {
                    [iAxis]: singleScale || iScale.parse(labels[index], index),
                    [vAxis]: vScale.parse(data[index], index)
                };
            }
            return parsed;
        }
        parseArrayData(meta, data, start, count) {
            const {xScale, yScale} = meta;
            const parsed = new Array(count);
            let i, ilen, index, item;
            for (i = 0, ilen = count; i < ilen; ++i) {
                index = i + start;
                item = data[index];
                parsed[i] = {
                    x: xScale.parse(item[0], index),
                    y: yScale.parse(item[1], index)
                };
            }
            return parsed;
        }
        parseObjectData(meta, data, start, count) {
            const {xScale, yScale} = meta;
            const {xAxisKey = 'x', yAxisKey = 'y'} = this._parsing;
            const parsed = new Array(count);
            let i, ilen, index, item;
            for (i = 0, ilen = count; i < ilen; ++i) {
                index = i + start;
                item = data[index];
                parsed[i] = {
                    x: xScale.parse(resolveObjectKey(item, xAxisKey), index),
                    y: yScale.parse(resolveObjectKey(item, yAxisKey), index)
                };
            }
            return parsed;
        }
        getParsed(index) {
            return this._cachedMeta._parsed[index];
        }
        getDataElement(index) {
            return this._cachedMeta.data[index];
        }
        applyStack(scale, parsed, mode) {
            const chart = this.chart;
            const meta = this._cachedMeta;
            const value = parsed[scale.axis];
            const stack = {
                keys: getSortedDatasetIndices(chart, true),
                values: parsed._stacks[scale.axis]
            };
            return applyStack(stack, value, meta.index, {mode});
        }
        updateRangeFromParsed(range, scale, parsed, stack) {
            const parsedValue = parsed[scale.axis];
            let value = parsedValue === null ? NaN : parsedValue;
            const values = stack && parsed._stacks[scale.axis];
            if (stack && values) {
                stack.values = values;
                value = applyStack(stack, parsedValue, this._cachedMeta.index);
            }
            range.min = Math.min(range.min, value);
            range.max = Math.max(range.max, value);
        }
        getMinMax(scale, canStack) {
            const meta = this._cachedMeta;
            const _parsed = meta._parsed;
            const sorted = meta._sorted && scale === meta.iScale;
            const ilen = _parsed.length;
            const otherScale = this._getOtherScale(scale);
            const stack = createStack(canStack, meta, this.chart);
            const range = {min: Number.POSITIVE_INFINITY, max: Number.NEGATIVE_INFINITY};
            const {min: otherMin, max: otherMax} = getUserBounds(otherScale);
            let i, parsed;
            function _skip() {
                parsed = _parsed[i];
                const otherValue = parsed[otherScale.axis];
                return !isNumberFinite(parsed[scale.axis]) || otherMin > otherValue || otherMax < otherValue;
            }
            for (i = 0; i < ilen; ++i) {
                if (_skip()) {
                    continue;
                }
                this.updateRangeFromParsed(range, scale, parsed, stack);
                if (sorted) {
                    break;
                }
            }
            if (sorted) {
                for (i = ilen - 1; i >= 0; --i) {
                    if (_skip()) {
                        continue;
                    }
                    this.updateRangeFromParsed(range, scale, parsed, stack);
                    break;
                }
            }
            return range;
        }
        getAllParsedValues(scale) {
            const parsed = this._cachedMeta._parsed;
            const values = [];
            let i, ilen, value;
            for (i = 0, ilen = parsed.length; i < ilen; ++i) {
                value = parsed[i][scale.axis];
                if (isNumberFinite(value)) {
                    values.push(value);
                }
            }
            return values;
        }
        getMaxOverflow() {
            return false;
        }
        getLabelAndValue(index) {
            const meta = this._cachedMeta;
            const iScale = meta.iScale;
            const vScale = meta.vScale;
            const parsed = this.getParsed(index);
            return {
                label: iScale ? '' + iScale.getLabelForValue(parsed[iScale.axis]) : '',
                value: vScale ? '' + vScale.getLabelForValue(parsed[vScale.axis]) : ''
            };
        }
        _update(mode) {
            const meta = this._cachedMeta;
            this.update(mode || 'default');
            meta._clip = toClip(valueOrDefault(this.options.clip, defaultClip(meta.xScale, meta.yScale, this.getMaxOverflow())));
        }
        update(mode) {}
        draw() {
            const ctx = this._ctx;
            const chart = this.chart;
            const meta = this._cachedMeta;
            const elements = meta.data || [];
            const area = chart.chartArea;
            const active = [];
            const start = this._drawStart || 0;
            const count = this._drawCount || (elements.length - start);
            const drawActiveElementsOnTop = this.options.drawActiveElementsOnTop;
            let i;
            if (meta.dataset) {
                meta.dataset.draw(ctx, area, start, count);
            }
            for (i = start; i < start + count; ++i) {
                const element = elements[i];
                if (element.hidden) {
                    continue;
                }
                if (element.active && drawActiveElementsOnTop) {
                    active.push(element);
                } else {
                    element.draw(ctx, area);
                }
            }
            for (i = 0; i < active.length; ++i) {
                active[i].draw(ctx, area);
            }
        }
        getStyle(index, active) {
            const mode = active ? 'active' : 'default';
            return index === undefined && this._cachedMeta.dataset
                ? this.resolveDatasetElementOptions(mode)
                : this.resolveDataElementOptions(index || 0, mode);
        }
        getContext(index, active, mode) {
            const dataset = this.getDataset();
            let context;
            if (index >= 0 && index < this._cachedMeta.data.length) {
                const element = this._cachedMeta.data[index];
                context = element.$context ||
                    (element.$context = createDataContext(this.getContext(), index, element));
                context.parsed = this.getParsed(index);
                context.raw = dataset.data[index];
                context.index = context.dataIndex = index;
            } else {
                context = this.$context ||
                    (this.$context = createDatasetContext(this.chart.getContext(), this.index));
                context.dataset = dataset;
                context.index = context.datasetIndex = this.index;
            }
            context.active = !!active;
            context.mode = mode;
            return context;
        }
        resolveDatasetElementOptions(mode) {
            return this._resolveElementOptions(this.datasetElementType.id, mode);
        }
        resolveDataElementOptions(index, mode) {
            return this._resolveElementOptions(this.dataElementType.id, mode, index);
        }
        _resolveElementOptions(elementType, mode = 'default', index) {
            const active = mode === 'active';
            const cache = this._cachedDataOpts;
            const cacheKey = elementType + '-' + mode;
            const cached = cache[cacheKey];
            const sharing = this.enableOptionSharing && defined(index);
            if (cached) {
                return cloneIfNotShared(cached, sharing);
            }
            const config = this.chart.config;
            const scopeKeys = config.datasetElementScopeKeys(this._type, elementType);
            const prefixes = active ? [`${elementType}Hover`, 'hover', elementType, ''] : [elementType, ''];
            const scopes = config.getOptionScopes(this.getDataset(), scopeKeys);
            const names = Object.keys(defaults.elements[elementType]);
            const context = () => this.getContext(index, active);
            const values = config.resolveNamedOptions(scopes, names, context, prefixes);
            if (values.$shared) {
                values.$shared = sharing;
                cache[cacheKey] = Object.freeze(cloneIfNotShared(values, sharing));
            }
            return values;
        }
        _resolveAnimations(index, transition, active) {
            const chart = this.chart;
            const cache = this._cachedDataOpts;
            const cacheKey = `animation-${transition}`;
            const cached = cache[cacheKey];
            if (cached) {
                return cached;
            }
            let options;
            if (chart.options.animation !== false) {
                const config = this.chart.config;
                const scopeKeys = config.datasetAnimationScopeKeys(this._type, transition);
                const scopes = config.getOptionScopes(this.getDataset(), scopeKeys);
                options = config.createResolver(scopes, this.getContext(index, active, transition));
            }
            const animations = new Animations(chart, options && options.animations);
            if (options && options._cacheable) {
                cache[cacheKey] = Object.freeze(animations);
            }
            return animations;
        }
        getSharedOptions(options) {
            if (!options.$shared) {
                return;
            }
            return this._sharedOptions || (this._sharedOptions = Object.assign({}, options));
        }
        includeOptions(mode, sharedOptions) {
            return !sharedOptions || isDirectUpdateMode(mode) || this.chart._animationsDisabled;
        }
        _getSharedOptions(start, mode) {
            const firstOpts = this.resolveDataElementOptions(start, mode);
            const previouslySharedOptions = this._sharedOptions;
            const sharedOptions = this.getSharedOptions(firstOpts);
            const includeOptions = this.includeOptions(mode, sharedOptions) || (sharedOptions !== previouslySharedOptions);
            this.updateSharedOptions(sharedOptions, mode, firstOpts);
            return {sharedOptions, includeOptions};
        }
        updateElement(element, index, properties, mode) {
            if (isDirectUpdateMode(mode)) {
                Object.assign(element, properties);
            } else {
                this._resolveAnimations(index, mode).update(element, properties);
            }
        }
        updateSharedOptions(sharedOptions, mode, newOptions) {
            if (sharedOptions && !isDirectUpdateMode(mode)) {
                this._resolveAnimations(undefined, mode).update(sharedOptions, newOptions);
            }
        }
        _setStyle(element, index, mode, active) {
            element.active = active;
            const options = this.getStyle(index, active);
            this._resolveAnimations(index, mode, active).update(element, {
                options: (!active && this.getSharedOptions(options)) || options
            });
        }
        removeHoverStyle(element, datasetIndex, index) {
            this._setStyle(element, index, 'active', false);
        }
        setHoverStyle(element, datasetIndex, index) {
            this._setStyle(element, index, 'active', true);
        }
        _removeDatasetHoverStyle() {
            const element = this._cachedMeta.dataset;
            if (element) {
                this._setStyle(element, undefined, 'active', false);
            }
        }
        _setDatasetHoverStyle() {
            const element = this._cachedMeta.dataset;
            if (element) {
                this._setStyle(element, undefined, 'active', true);
            }
        }
        _resyncElements(resetNewElements) {
            const data = this._data;
            const elements = this._cachedMeta.data;
            for (const [method, arg1, arg2] of this._syncList) {
                this[method](arg1, arg2);
            }
            this._syncList = [];
            const numMeta = elements.length;
            const numData = data.length;
            const count = Math.min(numData, numMeta);
            if (count) {
                this.parse(0, count);
            }
            if (numData > numMeta) {
                this._insertElements(numMeta, numData - numMeta, resetNewElements);
            } else if (numData < numMeta) {
                this._removeElements(numData, numMeta - numData);
            }
        }
        _insertElements(start, count, resetNewElements = true) {
            const meta = this._cachedMeta;
            const data = meta.data;
            const end = start + count;
            let i;
            const move = (arr) => {
                arr.length += count;
                for (i = arr.length - 1; i >= end; i--) {
                    arr[i] = arr[i - count];
                }
            };
            move(data);
            for (i = start; i < end; ++i) {
                data[i] = new this.dataElementType();
            }
            if (this._parsing) {
                move(meta._parsed);
            }
            this.parse(start, count);
            if (resetNewElements) {
                this.updateElements(data, start, count, 'reset');
            }
        }
        updateElements(element, start, count, mode) {}
        _removeElements(start, count) {
            const meta = this._cachedMeta;
            if (this._parsing) {
                const removed = meta._parsed.splice(start, count);
                if (meta._stacked) {
                    clearStacks(meta, removed);
                }
            }
            meta.data.splice(start, count);
        }
        _sync(args) {
            if (this._parsing) {
                this._syncList.push(args);
            } else {
                const [method, arg1, arg2] = args;
                this[method](arg1, arg2);
            }
            this.chart._dataChanges.push([this.index, ...args]);
        }
        _onDataPush() {
            const count = arguments.length;
            this._sync(['_insertElements', this.getDataset().data.length - count, count]);
        }
        _onDataPop() {
            this._sync(['_removeElements', this._cachedMeta.data.length - 1, 1]);
        }
        _onDataShift() {
            this._sync(['_removeElements', 0, 1]);
        }
        _onDataSplice(start, count) {
            if (count) {
                this._sync(['_removeElements', start, count]);
            }
            const newCount = arguments.length - 2;
            if (newCount) {
                this._sync(['_insertElements', start, newCount]);
            }
        }
        _onDataUnshift() {
            this._sync(['_insertElements', 0, arguments.length]);
        }
    }
    DatasetController.defaults = {};
    DatasetController.prototype.datasetElementType = null;
    DatasetController.prototype.dataElementType = null;

    class Element {
        constructor() {
            this.x = undefined;
            this.y = undefined;
            this.active = false;
            this.options = undefined;
            this.$animations = undefined;
        }
        tooltipPosition(useFinalPosition) {
            const {x, y} = this.getProps(['x', 'y'], useFinalPosition);
            return {x, y};
        }
        hasValue() {
            return isNumber(this.x) && isNumber(this.y);
        }
        getProps(props, final) {
            const anims = this.$animations;
            if (!final || !anims) {
                return this;
            }
            const ret = {};
            props.forEach(prop => {
                ret[prop] = anims[prop] && anims[prop].active() ? anims[prop]._to : this[prop];
            });
            return ret;
        }
    }
    Element.defaults = {};
    Element.defaultRoutes = undefined;

    const formatters = {
        values(value) {
            return isArray(value) ? value : '' + value;
        },
        numeric(tickValue, index, ticks) {
            if (tickValue === 0) {
                return '0';
            }
            const locale = this.chart.options.locale;
            let notation;
            let delta = tickValue;
            if (ticks.length > 1) {
                const maxTick = Math.max(Math.abs(ticks[0].value), Math.abs(ticks[ticks.length - 1].value));
                if (maxTick < 1e-4 || maxTick > 1e+15) {
                    notation = 'scientific';
                }
                delta = calculateDelta(tickValue, ticks);
            }
            const logDelta = log10(Math.abs(delta));
            const numDecimal = Math.max(Math.min(-1 * Math.floor(logDelta), 20), 0);
            const options = {notation, minimumFractionDigits: numDecimal, maximumFractionDigits: numDecimal};
            Object.assign(options, this.options.ticks.format);
            return formatNumber(tickValue, locale, options);
        },
        logarithmic(tickValue, index, ticks) {
            if (tickValue === 0) {
                return '0';
            }
            const remain = tickValue / (Math.pow(10, Math.floor(log10(tickValue))));
            if (remain === 1 || remain === 2 || remain === 5) {
                return formatters.numeric.call(this, tickValue, index, ticks);
            }
            return '';
        }
    };
    function calculateDelta(tickValue, ticks) {
        let delta = ticks.length > 3 ? ticks[2].value - ticks[1].value : ticks[1].value - ticks[0].value;
        if (Math.abs(delta) >= 1 && tickValue !== Math.floor(tickValue)) {
            delta = tickValue - Math.floor(tickValue);
        }
        return delta;
    }
    var Ticks = {formatters};

    defaults.set('scale', {
        display: true,
        offset: false,
        reverse: false,
        beginAtZero: false,
        bounds: 'ticks',
        grace: 0,
        grid: {
            display: true,
            lineWidth: 1,
            drawBorder: true,
            drawOnChartArea: true,
            drawTicks: true,
            tickLength: 8,
            tickWidth: (_ctx, options) => options.lineWidth,
            tickColor: (_ctx, options) => options.color,
            offset: false,
            borderDash: [],
            borderDashOffset: 0.0,
            borderWidth: 1
        },
        title: {
            display: false,
            text: '',
            padding: {
                top: 4,
                bottom: 4
            }
        },
        ticks: {
            minRotation: 0,
            maxRotation: 50,
            mirror: false,
            textStrokeWidth: 0,
            textStrokeColor: '',
            padding: 3,
            display: true,
            autoSkip: true,
            autoSkipPadding: 3,
            labelOffset: 0,
            callback: Ticks.formatters.values,
            minor: {},
            major: {},
            align: 'center',
            crossAlign: 'near',
            showLabelBackdrop: false,
            backdropColor: 'rgba(255, 255, 255, 0.75)',
            backdropPadding: 2,
        }
    });
    defaults.route('scale.ticks', 'color', '', 'color');
    defaults.route('scale.grid', 'color', '', 'borderColor');
    defaults.route('scale.grid', 'borderColor', '', 'borderColor');
    defaults.route('scale.title', 'color', '', 'color');
    defaults.describe('scale', {
        _fallback: false,
        _scriptable: (name) => !name.startsWith('before') && !name.startsWith('after') && name !== 'callback' && name !== 'parser',
        _indexable: (name) => name !== 'borderDash' && name !== 'tickBorderDash',
    });
    defaults.describe('scales', {
        _fallback: 'scale',
    });
    defaults.describe('scale.ticks', {
        _scriptable: (name) => name !== 'backdropPadding' && name !== 'callback',
        _indexable: (name) => name !== 'backdropPadding',
    });

    function autoSkip(scale, ticks) {
        const tickOpts = scale.options.ticks;
        const ticksLimit = tickOpts.maxTicksLimit || determineMaxTicks(scale);
        const majorIndices = tickOpts.major.enabled ? getMajorIndices(ticks) : [];
        const numMajorIndices = majorIndices.length;
        const first = majorIndices[0];
        const last = majorIndices[numMajorIndices - 1];
        const newTicks = [];
        if (numMajorIndices > ticksLimit) {
            skipMajors(ticks, newTicks, majorIndices, numMajorIndices / ticksLimit);
            return newTicks;
        }
        const spacing = calculateSpacing(majorIndices, ticks, ticksLimit);
        if (numMajorIndices > 0) {
            let i, ilen;
            const avgMajorSpacing = numMajorIndices > 1 ? Math.round((last - first) / (numMajorIndices - 1)) : null;
            skip(ticks, newTicks, spacing, isNullOrUndef(avgMajorSpacing) ? 0 : first - avgMajorSpacing, first);
            for (i = 0, ilen = numMajorIndices - 1; i < ilen; i++) {
                skip(ticks, newTicks, spacing, majorIndices[i], majorIndices[i + 1]);
            }
            skip(ticks, newTicks, spacing, last, isNullOrUndef(avgMajorSpacing) ? ticks.length : last + avgMajorSpacing);
            return newTicks;
        }
        skip(ticks, newTicks, spacing);
        return newTicks;
    }
    function determineMaxTicks(scale) {
        const offset = scale.options.offset;
        const tickLength = scale._tickSize();
        const maxScale = scale._length / tickLength + (offset ? 0 : 1);
        const maxChart = scale._maxLength / tickLength;
        return Math.floor(Math.min(maxScale, maxChart));
    }
    function calculateSpacing(majorIndices, ticks, ticksLimit) {
        const evenMajorSpacing = getEvenSpacing(majorIndices);
        const spacing = ticks.length / ticksLimit;
        if (!evenMajorSpacing) {
            return Math.max(spacing, 1);
        }
        const factors = _factorize(evenMajorSpacing);
        for (let i = 0, ilen = factors.length - 1; i < ilen; i++) {
            const factor = factors[i];
            if (factor > spacing) {
                return factor;
            }
        }
        return Math.max(spacing, 1);
    }
    function getMajorIndices(ticks) {
        const result = [];
        let i, ilen;
        for (i = 0, ilen = ticks.length; i < ilen; i++) {
            if (ticks[i].major) {
                result.push(i);
            }
        }
        return result;
    }
    function skipMajors(ticks, newTicks, majorIndices, spacing) {
        let count = 0;
        let next = majorIndices[0];
        let i;
        spacing = Math.ceil(spacing);
        for (i = 0; i < ticks.length; i++) {
            if (i === next) {
                newTicks.push(ticks[i]);
                count++;
                next = majorIndices[count * spacing];
            }
        }
    }
    function skip(ticks, newTicks, spacing, majorStart, majorEnd) {
        const start = valueOrDefault(majorStart, 0);
        const end = Math.min(valueOrDefault(majorEnd, ticks.length), ticks.length);
        let count = 0;
        let length, i, next;
        spacing = Math.ceil(spacing);
        if (majorEnd) {
            length = majorEnd - majorStart;
            spacing = length / Math.floor(length / spacing);
        }
        next = start;
        while (next < 0) {
            count++;
            next = Math.round(start + count * spacing);
        }
        for (i = Math.max(start, 0); i < end; i++) {
            if (i === next) {
                newTicks.push(ticks[i]);
                count++;
                next = Math.round(start + count * spacing);
            }
        }
    }
    function getEvenSpacing(arr) {
        const len = arr.length;
        let i, diff;
        if (len < 2) {
            return false;
        }
        for (diff = arr[0], i = 1; i < len; ++i) {
            if (arr[i] - arr[i - 1] !== diff) {
                return false;
            }
        }
        return diff;
    }

    const reverseAlign = (align) => align === 'left' ? 'right' : align === 'right' ? 'left' : align;
    const offsetFromEdge = (scale, edge, offset) => edge === 'top' || edge === 'left' ? scale[edge] + offset : scale[edge] - offset;
    function sample(arr, numItems) {
        const result = [];
        const increment = arr.length / numItems;
        const len = arr.length;
        let i = 0;
        for (; i < len; i += increment) {
            result.push(arr[Math.floor(i)]);
        }
        return result;
    }
    function getPixelForGridLine(scale, index, offsetGridLines) {
        const length = scale.ticks.length;
        const validIndex = Math.min(index, length - 1);
        const start = scale._startPixel;
        const end = scale._endPixel;
        const epsilon = 1e-6;
        let lineValue = scale.getPixelForTick(validIndex);
        let offset;
        if (offsetGridLines) {
            if (length === 1) {
                offset = Math.max(lineValue - start, end - lineValue);
            } else if (index === 0) {
                offset = (scale.getPixelForTick(1) - lineValue) / 2;
            } else {
                offset = (lineValue - scale.getPixelForTick(validIndex - 1)) / 2;
            }
            lineValue += validIndex < index ? offset : -offset;
            if (lineValue < start - epsilon || lineValue > end + epsilon) {
                return;
            }
        }
        return lineValue;
    }
    function garbageCollect(caches, length) {
        each(caches, (cache) => {
            const gc = cache.gc;
            const gcLen = gc.length / 2;
            let i;
            if (gcLen > length) {
                for (i = 0; i < gcLen; ++i) {
                    delete cache.data[gc[i]];
                }
                gc.splice(0, gcLen);
            }
        });
    }
    function getTickMarkLength(options) {
        return options.drawTicks ? options.tickLength : 0;
    }
    function getTitleHeight(options, fallback) {
        if (!options.display) {
            return 0;
        }
        const font = toFont(options.font, fallback);
        const padding = toPadding(options.padding);
        const lines = isArray(options.text) ? options.text.length : 1;
        return (lines * font.lineHeight) + padding.height;
    }
    function createScaleContext(parent, scale) {
        return createContext(parent, {
            scale,
            type: 'scale'
        });
    }
    function createTickContext(parent, index, tick) {
        return createContext(parent, {
            tick,
            index,
            type: 'tick'
        });
    }
    function titleAlign(align, position, reverse) {
        let ret = _toLeftRightCenter(align);
        if ((reverse && position !== 'right') || (!reverse && position === 'right')) {
            ret = reverseAlign(ret);
        }
        return ret;
    }
    function titleArgs(scale, offset, position, align) {
        const {top, left, bottom, right, chart} = scale;
        const {chartArea, scales} = chart;
        let rotation = 0;
        let maxWidth, titleX, titleY;
        const height = bottom - top;
        const width = right - left;
        if (scale.isHorizontal()) {
            titleX = _alignStartEnd(align, left, right);
            if (isObject(position)) {
                const positionAxisID = Object.keys(position)[0];
                const value = position[positionAxisID];
                titleY = scales[positionAxisID].getPixelForValue(value) + height - offset;
            } else if (position === 'center') {
                titleY = (chartArea.bottom + chartArea.top) / 2 + height - offset;
            } else {
                titleY = offsetFromEdge(scale, position, offset);
            }
            maxWidth = right - left;
        } else {
            if (isObject(position)) {
                const positionAxisID = Object.keys(position)[0];
                const value = position[positionAxisID];
                titleX = scales[positionAxisID].getPixelForValue(value) - width + offset;
            } else if (position === 'center') {
                titleX = (chartArea.left + chartArea.right) / 2 - width + offset;
            } else {
                titleX = offsetFromEdge(scale, position, offset);
            }
            titleY = _alignStartEnd(align, bottom, top);
            rotation = position === 'left' ? -HALF_PI : HALF_PI;
        }
        return {titleX, titleY, maxWidth, rotation};
    }
    class Scale extends Element {
        constructor(cfg) {
            super();
            this.id = cfg.id;
            this.type = cfg.type;
            this.options = undefined;
            this.ctx = cfg.ctx;
            this.chart = cfg.chart;
            this.top = undefined;
            this.bottom = undefined;
            this.left = undefined;
            this.right = undefined;
            this.width = undefined;
            this.height = undefined;
            this._margins = {
                left: 0,
                right: 0,
                top: 0,
                bottom: 0
            };
            this.maxWidth = undefined;
            this.maxHeight = undefined;
            this.paddingTop = undefined;
            this.paddingBottom = undefined;
            this.paddingLeft = undefined;
            this.paddingRight = undefined;
            this.axis = undefined;
            this.labelRotation = undefined;
            this.min = undefined;
            this.max = undefined;
            this._range = undefined;
            this.ticks = [];
            this._gridLineItems = null;
            this._labelItems = null;
            this._labelSizes = null;
            this._length = 0;
            this._maxLength = 0;
            this._longestTextCache = {};
            this._startPixel = undefined;
            this._endPixel = undefined;
            this._reversePixels = false;
            this._userMax = undefined;
            this._userMin = undefined;
            this._suggestedMax = undefined;
            this._suggestedMin = undefined;
            this._ticksLength = 0;
            this._borderValue = 0;
            this._cache = {};
            this._dataLimitsCached = false;
            this.$context = undefined;
        }
        init(options) {
            this.options = options.setContext(this.getContext());
            this.axis = options.axis;
            this._userMin = this.parse(options.min);
            this._userMax = this.parse(options.max);
            this._suggestedMin = this.parse(options.suggestedMin);
            this._suggestedMax = this.parse(options.suggestedMax);
        }
        parse(raw, index) {
            return raw;
        }
        getUserBounds() {
            let {_userMin, _userMax, _suggestedMin, _suggestedMax} = this;
            _userMin = finiteOrDefault(_userMin, Number.POSITIVE_INFINITY);
            _userMax = finiteOrDefault(_userMax, Number.NEGATIVE_INFINITY);
            _suggestedMin = finiteOrDefault(_suggestedMin, Number.POSITIVE_INFINITY);
            _suggestedMax = finiteOrDefault(_suggestedMax, Number.NEGATIVE_INFINITY);
            return {
                min: finiteOrDefault(_userMin, _suggestedMin),
                max: finiteOrDefault(_userMax, _suggestedMax),
                minDefined: isNumberFinite(_userMin),
                maxDefined: isNumberFinite(_userMax)
            };
        }
        getMinMax(canStack) {
            let {min, max, minDefined, maxDefined} = this.getUserBounds();
            let range;
            if (minDefined && maxDefined) {
                return {min, max};
            }
            const metas = this.getMatchingVisibleMetas();
            for (let i = 0, ilen = metas.length; i < ilen; ++i) {
                range = metas[i].controller.getMinMax(this, canStack);
                if (!minDefined) {
                    min = Math.min(min, range.min);
                }
                if (!maxDefined) {
                    max = Math.max(max, range.max);
                }
            }
            min = maxDefined && min > max ? max : min;
            max = minDefined && min > max ? min : max;
            return {
                min: finiteOrDefault(min, finiteOrDefault(max, min)),
                max: finiteOrDefault(max, finiteOrDefault(min, max))
            };
        }
        getPadding() {
            return {
                left: this.paddingLeft || 0,
                top: this.paddingTop || 0,
                right: this.paddingRight || 0,
                bottom: this.paddingBottom || 0
            };
        }
        getTicks() {
            return this.ticks;
        }
        getLabels() {
            const data = this.chart.data;
            return this.options.labels || (this.isHorizontal() ? data.xLabels : data.yLabels) || data.labels || [];
        }
        beforeLayout() {
            this._cache = {};
            this._dataLimitsCached = false;
        }
        beforeUpdate() {
            callback(this.options.beforeUpdate, [this]);
        }
        update(maxWidth, maxHeight, margins) {
            const {beginAtZero, grace, ticks: tickOpts} = this.options;
            const sampleSize = tickOpts.sampleSize;
            this.beforeUpdate();
            this.maxWidth = maxWidth;
            this.maxHeight = maxHeight;
            this._margins = margins = Object.assign({
                left: 0,
                right: 0,
                top: 0,
                bottom: 0
            }, margins);
            this.ticks = null;
            this._labelSizes = null;
            this._gridLineItems = null;
            this._labelItems = null;
            this.beforeSetDimensions();
            this.setDimensions();
            this.afterSetDimensions();
            this._maxLength = this.isHorizontal()
                ? this.width + margins.left + margins.right
                : this.height + margins.top + margins.bottom;
            if (!this._dataLimitsCached) {
                this.beforeDataLimits();
                this.determineDataLimits();
                this.afterDataLimits();
                this._range = _addGrace(this, grace, beginAtZero);
                this._dataLimitsCached = true;
            }
            this.beforeBuildTicks();
            this.ticks = this.buildTicks() || [];
            this.afterBuildTicks();
            const samplingEnabled = sampleSize < this.ticks.length;
            this._convertTicksToLabels(samplingEnabled ? sample(this.ticks, sampleSize) : this.ticks);
            this.configure();
            this.beforeCalculateLabelRotation();
            this.calculateLabelRotation();
            this.afterCalculateLabelRotation();
            if (tickOpts.display && (tickOpts.autoSkip || tickOpts.source === 'auto')) {
                this.ticks = autoSkip(this, this.ticks);
                this._labelSizes = null;
                this.afterAutoSkip();
            }
            if (samplingEnabled) {
                this._convertTicksToLabels(this.ticks);
            }
            this.beforeFit();
            this.fit();
            this.afterFit();
            this.afterUpdate();
        }
        configure() {
            let reversePixels = this.options.reverse;
            let startPixel, endPixel;
            if (this.isHorizontal()) {
                startPixel = this.left;
                endPixel = this.right;
            } else {
                startPixel = this.top;
                endPixel = this.bottom;
                reversePixels = !reversePixels;
            }
            this._startPixel = startPixel;
            this._endPixel = endPixel;
            this._reversePixels = reversePixels;
            this._length = endPixel - startPixel;
            this._alignToPixels = this.options.alignToPixels;
        }
        afterUpdate() {
            callback(this.options.afterUpdate, [this]);
        }
        beforeSetDimensions() {
            callback(this.options.beforeSetDimensions, [this]);
        }
        setDimensions() {
            if (this.isHorizontal()) {
                this.width = this.maxWidth;
                this.left = 0;
                this.right = this.width;
            } else {
                this.height = this.maxHeight;
                this.top = 0;
                this.bottom = this.height;
            }
            this.paddingLeft = 0;
            this.paddingTop = 0;
            this.paddingRight = 0;
            this.paddingBottom = 0;
        }
        afterSetDimensions() {
            callback(this.options.afterSetDimensions, [this]);
        }
        _callHooks(name) {
            this.chart.notifyPlugins(name, this.getContext());
            callback(this.options[name], [this]);
        }
        beforeDataLimits() {
            this._callHooks('beforeDataLimits');
        }
        determineDataLimits() {}
        afterDataLimits() {
            this._callHooks('afterDataLimits');
        }
        beforeBuildTicks() {
            this._callHooks('beforeBuildTicks');
        }
        buildTicks() {
            return [];
        }
        afterBuildTicks() {
            this._callHooks('afterBuildTicks');
        }
        beforeTickToLabelConversion() {
            callback(this.options.beforeTickToLabelConversion, [this]);
        }
        generateTickLabels(ticks) {
            const tickOpts = this.options.ticks;
            let i, ilen, tick;
            for (i = 0, ilen = ticks.length; i < ilen; i++) {
                tick = ticks[i];
                tick.label = callback(tickOpts.callback, [tick.value, i, ticks], this);
            }
        }
        afterTickToLabelConversion() {
            callback(this.options.afterTickToLabelConversion, [this]);
        }
        beforeCalculateLabelRotation() {
            callback(this.options.beforeCalculateLabelRotation, [this]);
        }
        calculateLabelRotation() {
            const options = this.options;
            const tickOpts = options.ticks;
            const numTicks = this.ticks.length;
            const minRotation = tickOpts.minRotation || 0;
            const maxRotation = tickOpts.maxRotation;
            let labelRotation = minRotation;
            let tickWidth, maxHeight, maxLabelDiagonal;
            if (!this._isVisible() || !tickOpts.display || minRotation >= maxRotation || numTicks <= 1 || !this.isHorizontal()) {
                this.labelRotation = minRotation;
                return;
            }
            const labelSizes = this._getLabelSizes();
            const maxLabelWidth = labelSizes.widest.width;
            const maxLabelHeight = labelSizes.highest.height;
            const maxWidth = _limitValue(this.chart.width - maxLabelWidth, 0, this.maxWidth);
            tickWidth = options.offset ? this.maxWidth / numTicks : maxWidth / (numTicks - 1);
            if (maxLabelWidth + 6 > tickWidth) {
                tickWidth = maxWidth / (numTicks - (options.offset ? 0.5 : 1));
                maxHeight = this.maxHeight - getTickMarkLength(options.grid)
                    - tickOpts.padding - getTitleHeight(options.title, this.chart.options.font);
                maxLabelDiagonal = Math.sqrt(maxLabelWidth * maxLabelWidth + maxLabelHeight * maxLabelHeight);
                labelRotation = toDegrees(Math.min(
                    Math.asin(_limitValue((labelSizes.highest.height + 6) / tickWidth, -1, 1)),
                    Math.asin(_limitValue(maxHeight / maxLabelDiagonal, -1, 1)) - Math.asin(_limitValue(maxLabelHeight / maxLabelDiagonal, -1, 1))
                ));
                labelRotation = Math.max(minRotation, Math.min(maxRotation, labelRotation));
            }
            this.labelRotation = labelRotation;
        }
        afterCalculateLabelRotation() {
            callback(this.options.afterCalculateLabelRotation, [this]);
        }
        afterAutoSkip() {}
        beforeFit() {
            callback(this.options.beforeFit, [this]);
        }
        fit() {
            const minSize = {
                width: 0,
                height: 0
            };
            const {chart, options: {ticks: tickOpts, title: titleOpts, grid: gridOpts}} = this;
            const display = this._isVisible();
            const isHorizontal = this.isHorizontal();
            if (display) {
                const titleHeight = getTitleHeight(titleOpts, chart.options.font);
                if (isHorizontal) {
                    minSize.width = this.maxWidth;
                    minSize.height = getTickMarkLength(gridOpts) + titleHeight;
                } else {
                    minSize.height = this.maxHeight;
                    minSize.width = getTickMarkLength(gridOpts) + titleHeight;
                }
                if (tickOpts.display && this.ticks.length) {
                    const {first, last, widest, highest} = this._getLabelSizes();
                    const tickPadding = tickOpts.padding * 2;
                    const angleRadians = toRadians(this.labelRotation);
                    const cos = Math.cos(angleRadians);
                    const sin = Math.sin(angleRadians);
                    if (isHorizontal) {
                        const labelHeight = tickOpts.mirror ? 0 : sin * widest.width + cos * highest.height;
                        minSize.height = Math.min(this.maxHeight, minSize.height + labelHeight + tickPadding);
                    } else {
                        const labelWidth = tickOpts.mirror ? 0 : cos * widest.width + sin * highest.height;
                        minSize.width = Math.min(this.maxWidth, minSize.width + labelWidth + tickPadding);
                    }
                    this._calculatePadding(first, last, sin, cos);
                }
            }
            this._handleMargins();
            if (isHorizontal) {
                this.width = this._length = chart.width - this._margins.left - this._margins.right;
                this.height = minSize.height;
            } else {
                this.width = minSize.width;
                this.height = this._length = chart.height - this._margins.top - this._margins.bottom;
            }
        }
        _calculatePadding(first, last, sin, cos) {
            const {ticks: {align, padding}, position} = this.options;
            const isRotated = this.labelRotation !== 0;
            const labelsBelowTicks = position !== 'top' && this.axis === 'x';
            if (this.isHorizontal()) {
                const offsetLeft = this.getPixelForTick(0) - this.left;
                const offsetRight = this.right - this.getPixelForTick(this.ticks.length - 1);
                let paddingLeft = 0;
                let paddingRight = 0;
                if (isRotated) {
                    if (labelsBelowTicks) {
                        paddingLeft = cos * first.width;
                        paddingRight = sin * last.height;
                    } else {
                        paddingLeft = sin * first.height;
                        paddingRight = cos * last.width;
                    }
                } else if (align === 'start') {
                    paddingRight = last.width;
                } else if (align === 'end') {
                    paddingLeft = first.width;
                } else if (align !== 'inner') {
                    paddingLeft = first.width / 2;
                    paddingRight = last.width / 2;
                }
                this.paddingLeft = Math.max((paddingLeft - offsetLeft + padding) * this.width / (this.width - offsetLeft), 0);
                this.paddingRight = Math.max((paddingRight - offsetRight + padding) * this.width / (this.width - offsetRight), 0);
            } else {
                let paddingTop = last.height / 2;
                let paddingBottom = first.height / 2;
                if (align === 'start') {
                    paddingTop = 0;
                    paddingBottom = first.height;
                } else if (align === 'end') {
                    paddingTop = last.height;
                    paddingBottom = 0;
                }
                this.paddingTop = paddingTop + padding;
                this.paddingBottom = paddingBottom + padding;
            }
        }
        _handleMargins() {
            if (this._margins) {
                this._margins.left = Math.max(this.paddingLeft, this._margins.left);
                this._margins.top = Math.max(this.paddingTop, this._margins.top);
                this._margins.right = Math.max(this.paddingRight, this._margins.right);
                this._margins.bottom = Math.max(this.paddingBottom, this._margins.bottom);
            }
        }
        afterFit() {
            callback(this.options.afterFit, [this]);
        }
        isHorizontal() {
            const {axis, position} = this.options;
            return position === 'top' || position === 'bottom' || axis === 'x';
        }
        isFullSize() {
            return this.options.fullSize;
        }
        _convertTicksToLabels(ticks) {
            this.beforeTickToLabelConversion();
            this.generateTickLabels(ticks);
            let i, ilen;
            for (i = 0, ilen = ticks.length; i < ilen; i++) {
                if (isNullOrUndef(ticks[i].label)) {
                    ticks.splice(i, 1);
                    ilen--;
                    i--;
                }
            }
            this.afterTickToLabelConversion();
        }
        _getLabelSizes() {
            let labelSizes = this._labelSizes;
            if (!labelSizes) {
                const sampleSize = this.options.ticks.sampleSize;
                let ticks = this.ticks;
                if (sampleSize < ticks.length) {
                    ticks = sample(ticks, sampleSize);
                }
                this._labelSizes = labelSizes = this._computeLabelSizes(ticks, ticks.length);
            }
            return labelSizes;
        }
        _computeLabelSizes(ticks, length) {
            const {ctx, _longestTextCache: caches} = this;
            const widths = [];
            const heights = [];
            let widestLabelSize = 0;
            let highestLabelSize = 0;
            let i, j, jlen, label, tickFont, fontString, cache, lineHeight, width, height, nestedLabel;
            for (i = 0; i < length; ++i) {
                label = ticks[i].label;
                tickFont = this._resolveTickFontOptions(i);
                ctx.font = fontString = tickFont.string;
                cache = caches[fontString] = caches[fontString] || {data: {}, gc: []};
                lineHeight = tickFont.lineHeight;
                width = height = 0;
                if (!isNullOrUndef(label) && !isArray(label)) {
                    width = _measureText(ctx, cache.data, cache.gc, width, label);
                    height = lineHeight;
                } else if (isArray(label)) {
                    for (j = 0, jlen = label.length; j < jlen; ++j) {
                        nestedLabel = label[j];
                        if (!isNullOrUndef(nestedLabel) && !isArray(nestedLabel)) {
                            width = _measureText(ctx, cache.data, cache.gc, width, nestedLabel);
                            height += lineHeight;
                        }
                    }
                }
                widths.push(width);
                heights.push(height);
                widestLabelSize = Math.max(width, widestLabelSize);
                highestLabelSize = Math.max(height, highestLabelSize);
            }
            garbageCollect(caches, length);
            const widest = widths.indexOf(widestLabelSize);
            const highest = heights.indexOf(highestLabelSize);
            const valueAt = (idx) => ({width: widths[idx] || 0, height: heights[idx] || 0});
            return {
                first: valueAt(0),
                last: valueAt(length - 1),
                widest: valueAt(widest),
                highest: valueAt(highest),
                widths,
                heights,
            };
        }
        getLabelForValue(value) {
            return value;
        }
        getPixelForValue(value, index) {
            return NaN;
        }
        getValueForPixel(pixel) {}
        getPixelForTick(index) {
            const ticks = this.ticks;
            if (index < 0 || index > ticks.length - 1) {
                return null;
            }
            return this.getPixelForValue(ticks[index].value);
        }
        getPixelForDecimal(decimal) {
            if (this._reversePixels) {
                decimal = 1 - decimal;
            }
            const pixel = this._startPixel + decimal * this._length;
            return _int16Range(this._alignToPixels ? _alignPixel(this.chart, pixel, 0) : pixel);
        }
        getDecimalForPixel(pixel) {
            const decimal = (pixel - this._startPixel) / this._length;
            return this._reversePixels ? 1 - decimal : decimal;
        }
        getBasePixel() {
            return this.getPixelForValue(this.getBaseValue());
        }
        getBaseValue() {
            const {min, max} = this;
            return min < 0 && max < 0 ? max :
                min > 0 && max > 0 ? min :
                    0;
        }
        getContext(index) {
            const ticks = this.ticks || [];
            if (index >= 0 && index < ticks.length) {
                const tick = ticks[index];
                return tick.$context ||
                    (tick.$context = createTickContext(this.getContext(), index, tick));
            }
            return this.$context ||
                (this.$context = createScaleContext(this.chart.getContext(), this));
        }
        _tickSize() {
            const optionTicks = this.options.ticks;
            const rot = toRadians(this.labelRotation);
            const cos = Math.abs(Math.cos(rot));
            const sin = Math.abs(Math.sin(rot));
            const labelSizes = this._getLabelSizes();
            const padding = optionTicks.autoSkipPadding || 0;
            const w = labelSizes ? labelSizes.widest.width + padding : 0;
            const h = labelSizes ? labelSizes.highest.height + padding : 0;
            return this.isHorizontal()
                ? h * cos > w * sin ? w / cos : h / sin
                : h * sin < w * cos ? h / cos : w / sin;
        }
        _isVisible() {
            const display = this.options.display;
            if (display !== 'auto') {
                return !!display;
            }
            return this.getMatchingVisibleMetas().length > 0;
        }
        _computeGridLineItems(chartArea) {
            const axis = this.axis;
            const chart = this.chart;
            const options = this.options;
            const {grid, position} = options;
            const offset = grid.offset;
            const isHorizontal = this.isHorizontal();
            const ticks = this.ticks;
            const ticksLength = ticks.length + (offset ? 1 : 0);
            const tl = getTickMarkLength(grid);
            const items = [];
            const borderOpts = grid.setContext(this.getContext());
            const axisWidth = borderOpts.drawBorder ? borderOpts.borderWidth : 0;
            const axisHalfWidth = axisWidth / 2;
            const alignBorderValue = function(pixel) {
                return _alignPixel(chart, pixel, axisWidth);
            };
            let borderValue, i, lineValue, alignedLineValue;
            let tx1, ty1, tx2, ty2, x1, y1, x2, y2;
            if (position === 'top') {
                borderValue = alignBorderValue(this.bottom);
                ty1 = this.bottom - tl;
                ty2 = borderValue - axisHalfWidth;
                y1 = alignBorderValue(chartArea.top) + axisHalfWidth;
                y2 = chartArea.bottom;
            } else if (position === 'bottom') {
                borderValue = alignBorderValue(this.top);
                y1 = chartArea.top;
                y2 = alignBorderValue(chartArea.bottom) - axisHalfWidth;
                ty1 = borderValue + axisHalfWidth;
                ty2 = this.top + tl;
            } else if (position === 'left') {
                borderValue = alignBorderValue(this.right);
                tx1 = this.right - tl;
                tx2 = borderValue - axisHalfWidth;
                x1 = alignBorderValue(chartArea.left) + axisHalfWidth;
                x2 = chartArea.right;
            } else if (position === 'right') {
                borderValue = alignBorderValue(this.left);
                x1 = chartArea.left;
                x2 = alignBorderValue(chartArea.right) - axisHalfWidth;
                tx1 = borderValue + axisHalfWidth;
                tx2 = this.left + tl;
            } else if (axis === 'x') {
                if (position === 'center') {
                    borderValue = alignBorderValue((chartArea.top + chartArea.bottom) / 2 + 0.5);
                } else if (isObject(position)) {
                    const positionAxisID = Object.keys(position)[0];
                    const value = position[positionAxisID];
                    borderValue = alignBorderValue(this.chart.scales[positionAxisID].getPixelForValue(value));
                }
                y1 = chartArea.top;
                y2 = chartArea.bottom;
                ty1 = borderValue + axisHalfWidth;
                ty2 = ty1 + tl;
            } else if (axis === 'y') {
                if (position === 'center') {
                    borderValue = alignBorderValue((chartArea.left + chartArea.right) / 2);
                } else if (isObject(position)) {
                    const positionAxisID = Object.keys(position)[0];
                    const value = position[positionAxisID];
                    borderValue = alignBorderValue(this.chart.scales[positionAxisID].getPixelForValue(value));
                }
                tx1 = borderValue - axisHalfWidth;
                tx2 = tx1 - tl;
                x1 = chartArea.left;
                x2 = chartArea.right;
            }
            const limit = valueOrDefault(options.ticks.maxTicksLimit, ticksLength);
            const step = Math.max(1, Math.ceil(ticksLength / limit));
            for (i = 0; i < ticksLength; i += step) {
                const optsAtIndex = grid.setContext(this.getContext(i));
                const lineWidth = optsAtIndex.lineWidth;
                const lineColor = optsAtIndex.color;
                const borderDash = optsAtIndex.borderDash || [];
                const borderDashOffset = optsAtIndex.borderDashOffset;
                const tickWidth = optsAtIndex.tickWidth;
                const tickColor = optsAtIndex.tickColor;
                const tickBorderDash = optsAtIndex.tickBorderDash || [];
                const tickBorderDashOffset = optsAtIndex.tickBorderDashOffset;
                lineValue = getPixelForGridLine(this, i, offset);
                if (lineValue === undefined) {
                    continue;
                }
                alignedLineValue = _alignPixel(chart, lineValue, lineWidth);
                if (isHorizontal) {
                    tx1 = tx2 = x1 = x2 = alignedLineValue;
                } else {
                    ty1 = ty2 = y1 = y2 = alignedLineValue;
                }
                items.push({
                    tx1,
                    ty1,
                    tx2,
                    ty2,
                    x1,
                    y1,
                    x2,
                    y2,
                    width: lineWidth,
                    color: lineColor,
                    borderDash,
                    borderDashOffset,
                    tickWidth,
                    tickColor,
                    tickBorderDash,
                    tickBorderDashOffset,
                });
            }
            this._ticksLength = ticksLength;
            this._borderValue = borderValue;
            return items;
        }
        _computeLabelItems(chartArea) {
            const axis = this.axis;
            const options = this.options;
            const {position, ticks: optionTicks} = options;
            const isHorizontal = this.isHorizontal();
            const ticks = this.ticks;
            const {align, crossAlign, padding, mirror} = optionTicks;
            const tl = getTickMarkLength(options.grid);
            const tickAndPadding = tl + padding;
            const hTickAndPadding = mirror ? -padding : tickAndPadding;
            const rotation = -toRadians(this.labelRotation);
            const items = [];
            let i, ilen, tick, label, x, y, textAlign, pixel, font, lineHeight, lineCount, textOffset;
            let textBaseline = 'middle';
            if (position === 'top') {
                y = this.bottom - hTickAndPadding;
                textAlign = this._getXAxisLabelAlignment();
            } else if (position === 'bottom') {
                y = this.top + hTickAndPadding;
                textAlign = this._getXAxisLabelAlignment();
            } else if (position === 'left') {
                const ret = this._getYAxisLabelAlignment(tl);
                textAlign = ret.textAlign;
                x = ret.x;
            } else if (position === 'right') {
                const ret = this._getYAxisLabelAlignment(tl);
                textAlign = ret.textAlign;
                x = ret.x;
            } else if (axis === 'x') {
                if (position === 'center') {
                    y = ((chartArea.top + chartArea.bottom) / 2) + tickAndPadding;
                } else if (isObject(position)) {
                    const positionAxisID = Object.keys(position)[0];
                    const value = position[positionAxisID];
                    y = this.chart.scales[positionAxisID].getPixelForValue(value) + tickAndPadding;
                }
                textAlign = this._getXAxisLabelAlignment();
            } else if (axis === 'y') {
                if (position === 'center') {
                    x = ((chartArea.left + chartArea.right) / 2) - tickAndPadding;
                } else if (isObject(position)) {
                    const positionAxisID = Object.keys(position)[0];
                    const value = position[positionAxisID];
                    x = this.chart.scales[positionAxisID].getPixelForValue(value);
                }
                textAlign = this._getYAxisLabelAlignment(tl).textAlign;
            }
            if (axis === 'y') {
                if (align === 'start') {
                    textBaseline = 'top';
                } else if (align === 'end') {
                    textBaseline = 'bottom';
                }
            }
            const labelSizes = this._getLabelSizes();
            for (i = 0, ilen = ticks.length; i < ilen; ++i) {
                tick = ticks[i];
                label = tick.label;
                const optsAtIndex = optionTicks.setContext(this.getContext(i));
                pixel = this.getPixelForTick(i) + optionTicks.labelOffset;
                font = this._resolveTickFontOptions(i);
                lineHeight = font.lineHeight;
                lineCount = isArray(label) ? label.length : 1;
                const halfCount = lineCount / 2;
                const color = optsAtIndex.color;
                const strokeColor = optsAtIndex.textStrokeColor;
                const strokeWidth = optsAtIndex.textStrokeWidth;
                let tickTextAlign = textAlign;
                if (isHorizontal) {
                    x = pixel;
                    if (textAlign === 'inner') {
                        if (i === ilen - 1) {
                            tickTextAlign = !this.options.reverse ? 'right' : 'left';
                        } else if (i === 0) {
                            tickTextAlign = !this.options.reverse ? 'left' : 'right';
                        } else {
                            tickTextAlign = 'center';
                        }
                    }
                    if (position === 'top') {
                        if (crossAlign === 'near' || rotation !== 0) {
                            textOffset = -lineCount * lineHeight + lineHeight / 2;
                        } else if (crossAlign === 'center') {
                            textOffset = -labelSizes.highest.height / 2 - halfCount * lineHeight + lineHeight;
                        } else {
                            textOffset = -labelSizes.highest.height + lineHeight / 2;
                        }
                    } else {
                        if (crossAlign === 'near' || rotation !== 0) {
                            textOffset = lineHeight / 2;
                        } else if (crossAlign === 'center') {
                            textOffset = labelSizes.highest.height / 2 - halfCount * lineHeight;
                        } else {
                            textOffset = labelSizes.highest.height - lineCount * lineHeight;
                        }
                    }
                    if (mirror) {
                        textOffset *= -1;
                    }
                } else {
                    y = pixel;
                    textOffset = (1 - lineCount) * lineHeight / 2;
                }
                let backdrop;
                if (optsAtIndex.showLabelBackdrop) {
                    const labelPadding = toPadding(optsAtIndex.backdropPadding);
                    const height = labelSizes.heights[i];
                    const width = labelSizes.widths[i];
                    let top = y + textOffset - labelPadding.top;
                    let left = x - labelPadding.left;
                    switch (textBaseline) {
                        case 'middle':
                            top -= height / 2;
                            break;
                        case 'bottom':
                            top -= height;
                            break;
                    }
                    switch (textAlign) {
                        case 'center':
                            left -= width / 2;
                            break;
                        case 'right':
                            left -= width;
                            break;
                    }
                    backdrop = {
                        left,
                        top,
                        width: width + labelPadding.width,
                        height: height + labelPadding.height,
                        color: optsAtIndex.backdropColor,
                    };
                }
                items.push({
                    rotation,
                    label,
                    font,
                    color,
                    strokeColor,
                    strokeWidth,
                    textOffset,
                    textAlign: tickTextAlign,
                    textBaseline,
                    translation: [x, y],
                    backdrop,
                });
            }
            return items;
        }
        _getXAxisLabelAlignment() {
            const {position, ticks} = this.options;
            const rotation = -toRadians(this.labelRotation);
            if (rotation) {
                return position === 'top' ? 'left' : 'right';
            }
            let align = 'center';
            if (ticks.align === 'start') {
                align = 'left';
            } else if (ticks.align === 'end') {
                align = 'right';
            } else if (ticks.align === 'inner') {
                align = 'inner';
            }
            return align;
        }
        _getYAxisLabelAlignment(tl) {
            const {position, ticks: {crossAlign, mirror, padding}} = this.options;
            const labelSizes = this._getLabelSizes();
            const tickAndPadding = tl + padding;
            const widest = labelSizes.widest.width;
            let textAlign;
            let x;
            if (position === 'left') {
                if (mirror) {
                    x = this.right + padding;
                    if (crossAlign === 'near') {
                        textAlign = 'left';
                    } else if (crossAlign === 'center') {
                        textAlign = 'center';
                        x += (widest / 2);
                    } else {
                        textAlign = 'right';
                        x += widest;
                    }
                } else {
                    x = this.right - tickAndPadding;
                    if (crossAlign === 'near') {
                        textAlign = 'right';
                    } else if (crossAlign === 'center') {
                        textAlign = 'center';
                        x -= (widest / 2);
                    } else {
                        textAlign = 'left';
                        x = this.left;
                    }
                }
            } else if (position === 'right') {
                if (mirror) {
                    x = this.left + padding;
                    if (crossAlign === 'near') {
                        textAlign = 'right';
                    } else if (crossAlign === 'center') {
                        textAlign = 'center';
                        x -= (widest / 2);
                    } else {
                        textAlign = 'left';
                        x -= widest;
                    }
                } else {
                    x = this.left + tickAndPadding;
                    if (crossAlign === 'near') {
                        textAlign = 'left';
                    } else if (crossAlign === 'center') {
                        textAlign = 'center';
                        x += widest / 2;
                    } else {
                        textAlign = 'right';
                        x = this.right;
                    }
                }
            } else {
                textAlign = 'right';
            }
            return {textAlign, x};
        }
        _computeLabelArea() {
            if (this.options.ticks.mirror) {
                return;
            }
            const chart = this.chart;
            const position = this.options.position;
            if (position === 'left' || position === 'right') {
                return {top: 0, left: this.left, bottom: chart.height, right: this.right};
            } if (position === 'top' || position === 'bottom') {
                return {top: this.top, left: 0, bottom: this.bottom, right: chart.width};
            }
        }
        drawBackground() {
            const {ctx, options: {backgroundColor}, left, top, width, height} = this;
            if (backgroundColor) {
                ctx.save();
                ctx.fillStyle = backgroundColor;
                ctx.fillRect(left, top, width, height);
                ctx.restore();
            }
        }
        getLineWidthForValue(value) {
            const grid = this.options.grid;
            if (!this._isVisible() || !grid.display) {
                return 0;
            }
            const ticks = this.ticks;
            const index = ticks.findIndex(t => t.value === value);
            if (index >= 0) {
                const opts = grid.setContext(this.getContext(index));
                return opts.lineWidth;
            }
            return 0;
        }
        drawGrid(chartArea) {
            const grid = this.options.grid;
            const ctx = this.ctx;
            const items = this._gridLineItems || (this._gridLineItems = this._computeGridLineItems(chartArea));
            let i, ilen;
            const drawLine = (p1, p2, style) => {
                if (!style.width || !style.color) {
                    return;
                }
                ctx.save();
                ctx.lineWidth = style.width;
                ctx.strokeStyle = style.color;
                ctx.setLineDash(style.borderDash || []);
                ctx.lineDashOffset = style.borderDashOffset;
                ctx.beginPath();
                ctx.moveTo(p1.x, p1.y);
                ctx.lineTo(p2.x, p2.y);
                ctx.stroke();
                ctx.restore();
            };
            if (grid.display) {
                for (i = 0, ilen = items.length; i < ilen; ++i) {
                    const item = items[i];
                    if (grid.drawOnChartArea) {
                        drawLine(
                            {x: item.x1, y: item.y1},
                            {x: item.x2, y: item.y2},
                            item
                        );
                    }
                    if (grid.drawTicks) {
                        drawLine(
                            {x: item.tx1, y: item.ty1},
                            {x: item.tx2, y: item.ty2},
                            {
                                color: item.tickColor,
                                width: item.tickWidth,
                                borderDash: item.tickBorderDash,
                                borderDashOffset: item.tickBorderDashOffset
                            }
                        );
                    }
                }
            }
        }
        drawBorder() {
            const {chart, ctx, options: {grid}} = this;
            const borderOpts = grid.setContext(this.getContext());
            const axisWidth = grid.drawBorder ? borderOpts.borderWidth : 0;
            if (!axisWidth) {
                return;
            }
            const lastLineWidth = grid.setContext(this.getContext(0)).lineWidth;
            const borderValue = this._borderValue;
            let x1, x2, y1, y2;
            if (this.isHorizontal()) {
                x1 = _alignPixel(chart, this.left, axisWidth) - axisWidth / 2;
                x2 = _alignPixel(chart, this.right, lastLineWidth) + lastLineWidth / 2;
                y1 = y2 = borderValue;
            } else {
                y1 = _alignPixel(chart, this.top, axisWidth) - axisWidth / 2;
                y2 = _alignPixel(chart, this.bottom, lastLineWidth) + lastLineWidth / 2;
                x1 = x2 = borderValue;
            }
            ctx.save();
            ctx.lineWidth = borderOpts.borderWidth;
            ctx.strokeStyle = borderOpts.borderColor;
            ctx.beginPath();
            ctx.moveTo(x1, y1);
            ctx.lineTo(x2, y2);
            ctx.stroke();
            ctx.restore();
        }
        drawLabels(chartArea) {
            const optionTicks = this.options.ticks;
            if (!optionTicks.display) {
                return;
            }
            const ctx = this.ctx;
            const area = this._computeLabelArea();
            if (area) {
                clipArea(ctx, area);
            }
            const items = this._labelItems || (this._labelItems = this._computeLabelItems(chartArea));
            let i, ilen;
            for (i = 0, ilen = items.length; i < ilen; ++i) {
                const item = items[i];
                const tickFont = item.font;
                const label = item.label;
                if (item.backdrop) {
                    ctx.fillStyle = item.backdrop.color;
                    ctx.fillRect(item.backdrop.left, item.backdrop.top, item.backdrop.width, item.backdrop.height);
                }
                let y = item.textOffset;
                renderText(ctx, label, 0, y, tickFont, item);
            }
            if (area) {
                unclipArea(ctx);
            }
        }
        drawTitle() {
            const {ctx, options: {position, title, reverse}} = this;
            if (!title.display) {
                return;
            }
            const font = toFont(title.font);
            const padding = toPadding(title.padding);
            const align = title.align;
            let offset = font.lineHeight / 2;
            if (position === 'bottom' || position === 'center' || isObject(position)) {
                offset += padding.bottom;
                if (isArray(title.text)) {
                    offset += font.lineHeight * (title.text.length - 1);
                }
            } else {
                offset += padding.top;
            }
            const {titleX, titleY, maxWidth, rotation} = titleArgs(this, offset, position, align);
            renderText(ctx, title.text, 0, 0, font, {
                color: title.color,
                maxWidth,
                rotation,
                textAlign: titleAlign(align, position, reverse),
                textBaseline: 'middle',
                translation: [titleX, titleY],
            });
        }
        draw(chartArea) {
            if (!this._isVisible()) {
                return;
            }
            this.drawBackground();
            this.drawGrid(chartArea);
            this.drawBorder();
            this.drawTitle();
            this.drawLabels(chartArea);
        }
        _layers() {
            const opts = this.options;
            const tz = opts.ticks && opts.ticks.z || 0;
            const gz = valueOrDefault(opts.grid && opts.grid.z, -1);
            if (!this._isVisible() || this.draw !== Scale.prototype.draw) {
                return [{
                    z: tz,
                    draw: (chartArea) => {
                        this.draw(chartArea);
                    }
                }];
            }
            return [{
                z: gz,
                draw: (chartArea) => {
                    this.drawBackground();
                    this.drawGrid(chartArea);
                    this.drawTitle();
                }
            }, {
                z: gz + 1,
                draw: () => {
                    this.drawBorder();
                }
            }, {
                z: tz,
                draw: (chartArea) => {
                    this.drawLabels(chartArea);
                }
            }];
        }
        getMatchingVisibleMetas(type) {
            const metas = this.chart.getSortedVisibleDatasetMetas();
            const axisID = this.axis + 'AxisID';
            const result = [];
            let i, ilen;
            for (i = 0, ilen = metas.length; i < ilen; ++i) {
                const meta = metas[i];
                if (meta[axisID] === this.id && (!type || meta.type === type)) {
                    result.push(meta);
                }
            }
            return result;
        }
        _resolveTickFontOptions(index) {
            const opts = this.options.ticks.setContext(this.getContext(index));
            return toFont(opts.font);
        }
        _maxDigits() {
            const fontSize = this._resolveTickFontOptions(0).lineHeight;
            return (this.isHorizontal() ? this.width : this.height) / fontSize;
        }
    }

    class TypedRegistry {
        constructor(type, scope, override) {
            this.type = type;
            this.scope = scope;
            this.override = override;
            this.items = Object.create(null);
        }
        isForType(type) {
            return Object.prototype.isPrototypeOf.call(this.type.prototype, type.prototype);
        }
        register(item) {
            const proto = Object.getPrototypeOf(item);
            let parentScope;
            if (isIChartComponent(proto)) {
                parentScope = this.register(proto);
            }
            const items = this.items;
            const id = item.id;
            const scope = this.scope + '.' + id;
            if (!id) {
                throw new Error('class does not have id: ' + item);
            }
            if (id in items) {
                return scope;
            }
            items[id] = item;
            registerDefaults(item, scope, parentScope);
            if (this.override) {
                defaults.override(item.id, item.overrides);
            }
            return scope;
        }
        get(id) {
            return this.items[id];
        }
        unregister(item) {
            const items = this.items;
            const id = item.id;
            const scope = this.scope;
            if (id in items) {
                delete items[id];
            }
            if (scope && id in defaults[scope]) {
                delete defaults[scope][id];
                if (this.override) {
                    delete overrides[id];
                }
            }
        }
    }
    function registerDefaults(item, scope, parentScope) {
        const itemDefaults = merge(Object.create(null), [
            parentScope ? defaults.get(parentScope) : {},
            defaults.get(scope),
            item.defaults
        ]);
        defaults.set(scope, itemDefaults);
        if (item.defaultRoutes) {
            routeDefaults(scope, item.defaultRoutes);
        }
        if (item.descriptors) {
            defaults.describe(scope, item.descriptors);
        }
    }
    function routeDefaults(scope, routes) {
        Object.keys(routes).forEach(property => {
            const propertyParts = property.split('.');
            const sourceName = propertyParts.pop();
            const sourceScope = [scope].concat(propertyParts).join('.');
            const parts = routes[property].split('.');
            const targetName = parts.pop();
            const targetScope = parts.join('.');
            defaults.route(sourceScope, sourceName, targetScope, targetName);
        });
    }
    function isIChartComponent(proto) {
        return 'id' in proto && 'defaults' in proto;
    }

    class Registry {
        constructor() {
            this.controllers = new TypedRegistry(DatasetController, 'datasets', true);
            this.elements = new TypedRegistry(Element, 'elements');
            this.plugins = new TypedRegistry(Object, 'plugins');
            this.scales = new TypedRegistry(Scale, 'scales');
            this._typedRegistries = [this.controllers, this.scales, this.elements];
        }
        add(...args) {
            this._each('register', args);
        }
        remove(...args) {
            this._each('unregister', args);
        }
        addControllers(...args) {
            this._each('register', args, this.controllers);
        }
        addElements(...args) {
            this._each('register', args, this.elements);
        }
        addPlugins(...args) {
            this._each('register', args, this.plugins);
        }
        addScales(...args) {
            this._each('register', args, this.scales);
        }
        getController(id) {
            return this._get(id, this.controllers, 'controller');
        }
        getElement(id) {
            return this._get(id, this.elements, 'element');
        }
        getPlugin(id) {
            return this._get(id, this.plugins, 'plugin');
        }
        getScale(id) {
            return this._get(id, this.scales, 'scale');
        }
        removeControllers(...args) {
            this._each('unregister', args, this.controllers);
        }
        removeElements(...args) {
            this._each('unregister', args, this.elements);
        }
        removePlugins(...args) {
            this._each('unregister', args, this.plugins);
        }
        removeScales(...args) {
            this._each('unregister', args, this.scales);
        }
        _each(method, args, typedRegistry) {
            [...args].forEach(arg => {
                const reg = typedRegistry || this._getRegistryForType(arg);
                if (typedRegistry || reg.isForType(arg) || (reg === this.plugins && arg.id)) {
                    this._exec(method, reg, arg);
                } else {
                    each(arg, item => {
                        const itemReg = typedRegistry || this._getRegistryForType(item);
                        this._exec(method, itemReg, item);
                    });
                }
            });
        }
        _exec(method, registry, component) {
            const camelMethod = _capitalize(method);
            callback(component['before' + camelMethod], [], component);
            registry[method](component);
            callback(component['after' + camelMethod], [], component);
        }
        _getRegistryForType(type) {
            for (let i = 0; i < this._typedRegistries.length; i++) {
                const reg = this._typedRegistries[i];
                if (reg.isForType(type)) {
                    return reg;
                }
            }
            return this.plugins;
        }
        _get(id, typedRegistry, type) {
            const item = typedRegistry.get(id);
            if (item === undefined) {
                throw new Error('"' + id + '" is not a registered ' + type + '.');
            }
            return item;
        }
    }
    var registry = new Registry();

    class PluginService {
        constructor() {
            this._init = [];
        }
        notify(chart, hook, args, filter) {
            if (hook === 'beforeInit') {
                this._init = this._createDescriptors(chart, true);
                this._notify(this._init, chart, 'install');
            }
            const descriptors = filter ? this._descriptors(chart).filter(filter) : this._descriptors(chart);
            const result = this._notify(descriptors, chart, hook, args);
            if (hook === 'afterDestroy') {
                this._notify(descriptors, chart, 'stop');
                this._notify(this._init, chart, 'uninstall');
            }
            return result;
        }
        _notify(descriptors, chart, hook, args) {
            args = args || {};
            for (const descriptor of descriptors) {
                const plugin = descriptor.plugin;
                const method = plugin[hook];
                const params = [chart, args, descriptor.options];
                if (callback(method, params, plugin) === false && args.cancelable) {
                    return false;
                }
            }
            return true;
        }
        invalidate() {
            if (!isNullOrUndef(this._cache)) {
                this._oldCache = this._cache;
                this._cache = undefined;
            }
        }
        _descriptors(chart) {
            if (this._cache) {
                return this._cache;
            }
            const descriptors = this._cache = this._createDescriptors(chart);
            this._notifyStateChanges(chart);
            return descriptors;
        }
        _createDescriptors(chart, all) {
            const config = chart && chart.config;
            const options = valueOrDefault(config.options && config.options.plugins, {});
            const plugins = allPlugins(config);
            return options === false && !all ? [] : createDescriptors(chart, plugins, options, all);
        }
        _notifyStateChanges(chart) {
            const previousDescriptors = this._oldCache || [];
            const descriptors = this._cache;
            const diff = (a, b) => a.filter(x => !b.some(y => x.plugin.id === y.plugin.id));
            this._notify(diff(previousDescriptors, descriptors), chart, 'stop');
            this._notify(diff(descriptors, previousDescriptors), chart, 'start');
        }
    }
    function allPlugins(config) {
        const localIds = {};
        const plugins = [];
        const keys = Object.keys(registry.plugins.items);
        for (let i = 0; i < keys.length; i++) {
            plugins.push(registry.getPlugin(keys[i]));
        }
        const local = config.plugins || [];
        for (let i = 0; i < local.length; i++) {
            const plugin = local[i];
            if (plugins.indexOf(plugin) === -1) {
                plugins.push(plugin);
                localIds[plugin.id] = true;
            }
        }
        return {plugins, localIds};
    }
    function getOpts(options, all) {
        if (!all && options === false) {
            return null;
        }
        if (options === true) {
            return {};
        }
        return options;
    }
    function createDescriptors(chart, {plugins, localIds}, options, all) {
        const result = [];
        const context = chart.getContext();
        for (const plugin of plugins) {
            const id = plugin.id;
            const opts = getOpts(options[id], all);
            if (opts === null) {
                continue;
            }
            result.push({
                plugin,
                options: pluginOpts(chart.config, {plugin, local: localIds[id]}, opts, context)
            });
        }
        return result;
    }
    function pluginOpts(config, {plugin, local}, opts, context) {
        const keys = config.pluginScopeKeys(plugin);
        const scopes = config.getOptionScopes(opts, keys);
        if (local && plugin.defaults) {
            scopes.push(plugin.defaults);
        }
        return config.createResolver(scopes, context, [''], {
            scriptable: false,
            indexable: false,
            allKeys: true
        });
    }

    function getIndexAxis(type, options) {
        const datasetDefaults = defaults.datasets[type] || {};
        const datasetOptions = (options.datasets || {})[type] || {};
        return datasetOptions.indexAxis || options.indexAxis || datasetDefaults.indexAxis || 'x';
    }
    function getAxisFromDefaultScaleID(id, indexAxis) {
        let axis = id;
        if (id === '_index_') {
            axis = indexAxis;
        } else if (id === '_value_') {
            axis = indexAxis === 'x' ? 'y' : 'x';
        }
        return axis;
    }
    function getDefaultScaleIDFromAxis(axis, indexAxis) {
        return axis === indexAxis ? '_index_' : '_value_';
    }
    function axisFromPosition(position) {
        if (position === 'top' || position === 'bottom') {
            return 'x';
        }
        if (position === 'left' || position === 'right') {
            return 'y';
        }
    }
    function determineAxis(id, scaleOptions) {
        if (id === 'x' || id === 'y') {
            return id;
        }
        return scaleOptions.axis || axisFromPosition(scaleOptions.position) || id.charAt(0).toLowerCase();
    }
    function mergeScaleConfig(config, options) {
        const chartDefaults = overrides[config.type] || {scales: {}};
        const configScales = options.scales || {};
        const chartIndexAxis = getIndexAxis(config.type, options);
        const firstIDs = Object.create(null);
        const scales = Object.create(null);
        Object.keys(configScales).forEach(id => {
            const scaleConf = configScales[id];
            if (!isObject(scaleConf)) {
                return console.error(`Invalid scale configuration for scale: ${id}`);
            }
            if (scaleConf._proxy) {
                return console.warn(`Ignoring resolver passed as options for scale: ${id}`);
            }
            const axis = determineAxis(id, scaleConf);
            const defaultId = getDefaultScaleIDFromAxis(axis, chartIndexAxis);
            const defaultScaleOptions = chartDefaults.scales || {};
            firstIDs[axis] = firstIDs[axis] || id;
            scales[id] = mergeIf(Object.create(null), [{axis}, scaleConf, defaultScaleOptions[axis], defaultScaleOptions[defaultId]]);
        });
        config.data.datasets.forEach(dataset => {
            const type = dataset.type || config.type;
            const indexAxis = dataset.indexAxis || getIndexAxis(type, options);
            const datasetDefaults = overrides[type] || {};
            const defaultScaleOptions = datasetDefaults.scales || {};
            Object.keys(defaultScaleOptions).forEach(defaultID => {
                const axis = getAxisFromDefaultScaleID(defaultID, indexAxis);
                const id = dataset[axis + 'AxisID'] || firstIDs[axis] || axis;
                scales[id] = scales[id] || Object.create(null);
                mergeIf(scales[id], [{axis}, configScales[id], defaultScaleOptions[defaultID]]);
            });
        });
        Object.keys(scales).forEach(key => {
            const scale = scales[key];
            mergeIf(scale, [defaults.scales[scale.type], defaults.scale]);
        });
        return scales;
    }
    function initOptions(config) {
        const options = config.options || (config.options = {});
        options.plugins = valueOrDefault(options.plugins, {});
        options.scales = mergeScaleConfig(config, options);
    }
    function initData(data) {
        data = data || {};
        data.datasets = data.datasets || [];
        data.labels = data.labels || [];
        return data;
    }
    function initConfig(config) {
        config = config || {};
        config.data = initData(config.data);
        initOptions(config);
        return config;
    }
    const keyCache = new Map();
    const keysCached = new Set();
    function cachedKeys(cacheKey, generate) {
        let keys = keyCache.get(cacheKey);
        if (!keys) {
            keys = generate();
            keyCache.set(cacheKey, keys);
            keysCached.add(keys);
        }
        return keys;
    }
    const addIfFound = (set, obj, key) => {
        const opts = resolveObjectKey(obj, key);
        if (opts !== undefined) {
            set.add(opts);
        }
    };
    class Config {
        constructor(config) {
            this._config = initConfig(config);
            this._scopeCache = new Map();
            this._resolverCache = new Map();
        }
        get platform() {
            return this._config.platform;
        }
        get type() {
            return this._config.type;
        }
        set type(type) {
            this._config.type = type;
        }
        get data() {
            return this._config.data;
        }
        set data(data) {
            this._config.data = initData(data);
        }
        get options() {
            return this._config.options;
        }
        set options(options) {
            this._config.options = options;
        }
        get plugins() {
            return this._config.plugins;
        }
        update() {
            const config = this._config;
            this.clearCache();
            initOptions(config);
        }
        clearCache() {
            this._scopeCache.clear();
            this._resolverCache.clear();
        }
        datasetScopeKeys(datasetType) {
            return cachedKeys(datasetType,
                () => [[
                    `datasets.${datasetType}`,
                    ''
                ]]);
        }
        datasetAnimationScopeKeys(datasetType, transition) {
            return cachedKeys(`${datasetType}.transition.${transition}`,
                () => [
                    [
                        `datasets.${datasetType}.transitions.${transition}`,
                        `transitions.${transition}`,
                    ],
                    [
                        `datasets.${datasetType}`,
                        ''
                    ]
                ]);
        }
        datasetElementScopeKeys(datasetType, elementType) {
            return cachedKeys(`${datasetType}-${elementType}`,
                () => [[
                    `datasets.${datasetType}.elements.${elementType}`,
                    `datasets.${datasetType}`,
                    `elements.${elementType}`,
                    ''
                ]]);
        }
        pluginScopeKeys(plugin) {
            const id = plugin.id;
            const type = this.type;
            return cachedKeys(`${type}-plugin-${id}`,
                () => [[
                    `plugins.${id}`,
                    ...plugin.additionalOptionScopes || [],
                ]]);
        }
        _cachedScopes(mainScope, resetCache) {
            const _scopeCache = this._scopeCache;
            let cache = _scopeCache.get(mainScope);
            if (!cache || resetCache) {
                cache = new Map();
                _scopeCache.set(mainScope, cache);
            }
            return cache;
        }
        getOptionScopes(mainScope, keyLists, resetCache) {
            const {options, type} = this;
            const cache = this._cachedScopes(mainScope, resetCache);
            const cached = cache.get(keyLists);
            if (cached) {
                return cached;
            }
            const scopes = new Set();
            keyLists.forEach(keys => {
                if (mainScope) {
                    scopes.add(mainScope);
                    keys.forEach(key => addIfFound(scopes, mainScope, key));
                }
                keys.forEach(key => addIfFound(scopes, options, key));
                keys.forEach(key => addIfFound(scopes, overrides[type] || {}, key));
                keys.forEach(key => addIfFound(scopes, defaults, key));
                keys.forEach(key => addIfFound(scopes, descriptors, key));
            });
            const array = Array.from(scopes);
            if (array.length === 0) {
                array.push(Object.create(null));
            }
            if (keysCached.has(keyLists)) {
                cache.set(keyLists, array);
            }
            return array;
        }
        chartOptionScopes() {
            const {options, type} = this;
            return [
                options,
                overrides[type] || {},
                defaults.datasets[type] || {},
                {type},
                defaults,
                descriptors
            ];
        }
        resolveNamedOptions(scopes, names, context, prefixes = ['']) {
            const result = {$shared: true};
            const {resolver, subPrefixes} = getResolver(this._resolverCache, scopes, prefixes);
            let options = resolver;
            if (needContext(resolver, names)) {
                result.$shared = false;
                context = isFunction(context) ? context() : context;
                const subResolver = this.createResolver(scopes, context, subPrefixes);
                options = _attachContext(resolver, context, subResolver);
            }
            for (const prop of names) {
                result[prop] = options[prop];
            }
            return result;
        }
        createResolver(scopes, context, prefixes = [''], descriptorDefaults) {
            const {resolver} = getResolver(this._resolverCache, scopes, prefixes);
            return isObject(context)
                ? _attachContext(resolver, context, undefined, descriptorDefaults)
                : resolver;
        }
    }
    function getResolver(resolverCache, scopes, prefixes) {
        let cache = resolverCache.get(scopes);
        if (!cache) {
            cache = new Map();
            resolverCache.set(scopes, cache);
        }
        const cacheKey = prefixes.join();
        let cached = cache.get(cacheKey);
        if (!cached) {
            const resolver = _createResolver(scopes, prefixes);
            cached = {
                resolver,
                subPrefixes: prefixes.filter(p => !p.toLowerCase().includes('hover'))
            };
            cache.set(cacheKey, cached);
        }
        return cached;
    }
    const hasFunction = value => isObject(value)
        && Object.getOwnPropertyNames(value).reduce((acc, key) => acc || isFunction(value[key]), false);
    function needContext(proxy, names) {
        const {isScriptable, isIndexable} = _descriptors(proxy);
        for (const prop of names) {
            const scriptable = isScriptable(prop);
            const indexable = isIndexable(prop);
            const value = (indexable || scriptable) && proxy[prop];
            if ((scriptable && (isFunction(value) || hasFunction(value)))
                || (indexable && isArray(value))) {
                return true;
            }
        }
        return false;
    }

    var version = "3.9.1";

    const KNOWN_POSITIONS = ['top', 'bottom', 'left', 'right', 'chartArea'];
    function positionIsHorizontal(position, axis) {
        return position === 'top' || position === 'bottom' || (KNOWN_POSITIONS.indexOf(position) === -1 && axis === 'x');
    }
    function compare2Level(l1, l2) {
        return function(a, b) {
            return a[l1] === b[l1]
                ? a[l2] - b[l2]
                : a[l1] - b[l1];
        };
    }
    function onAnimationsComplete(context) {
        const chart = context.chart;
        const animationOptions = chart.options.animation;
        chart.notifyPlugins('afterRender');
        callback(animationOptions && animationOptions.onComplete, [context], chart);
    }
    function onAnimationProgress(context) {
        const chart = context.chart;
        const animationOptions = chart.options.animation;
        callback(animationOptions && animationOptions.onProgress, [context], chart);
    }
    function getCanvas(item) {
        if (_isDomSupported() && typeof item === 'string') {
            item = document.getElementById(item);
        } else if (item && item.length) {
            item = item[0];
        }
        if (item && item.canvas) {
            item = item.canvas;
        }
        return item;
    }
    const instances = {};
    const getChart = (key) => {
        const canvas = getCanvas(key);
        return Object.values(instances).filter((c) => c.canvas === canvas).pop();
    };
    function moveNumericKeys(obj, start, move) {
        const keys = Object.keys(obj);
        for (const key of keys) {
            const intKey = +key;
            if (intKey >= start) {
                const value = obj[key];
                delete obj[key];
                if (move > 0 || intKey > start) {
                    obj[intKey + move] = value;
                }
            }
        }
    }
    function determineLastEvent(e, lastEvent, inChartArea, isClick) {
        if (!inChartArea || e.type === 'mouseout') {
            return null;
        }
        if (isClick) {
            return lastEvent;
        }
        return e;
    }
    class Chart {
        constructor(item, userConfig) {
            const config = this.config = new Config(userConfig);
            const initialCanvas = getCanvas(item);
            const existingChart = getChart(initialCanvas);
            if (existingChart) {
                throw new Error(
                    'Canvas is already in use. Chart with ID \'' + existingChart.id + '\'' +
                    ' must be destroyed before the canvas with ID \'' + existingChart.canvas.id + '\' can be reused.'
                );
            }
            const options = config.createResolver(config.chartOptionScopes(), this.getContext());
            this.platform = new (config.platform || _detectPlatform(initialCanvas))();
            this.platform.updateConfig(config);
            const context = this.platform.acquireContext(initialCanvas, options.aspectRatio);
            const canvas = context && context.canvas;
            const height = canvas && canvas.height;
            const width = canvas && canvas.width;
            this.id = uid();
            this.ctx = context;
            this.canvas = canvas;
            this.width = width;
            this.height = height;
            this._options = options;
            this._aspectRatio = this.aspectRatio;
            this._layers = [];
            this._metasets = [];
            this._stacks = undefined;
            this.boxes = [];
            this.currentDevicePixelRatio = undefined;
            this.chartArea = undefined;
            this._active = [];
            this._lastEvent = undefined;
            this._listeners = {};
            this._responsiveListeners = undefined;
            this._sortedMetasets = [];
            this.scales = {};
            this._plugins = new PluginService();
            this.$proxies = {};
            this._hiddenIndices = {};
            this.attached = false;
            this._animationsDisabled = undefined;
            this.$context = undefined;
            this._doResize = debounce(mode => this.update(mode), options.resizeDelay || 0);
            this._dataChanges = [];
            instances[this.id] = this;
            if (!context || !canvas) {
                console.error("Failed to create chart: can't acquire context from the given item");
                return;
            }
            animator.listen(this, 'complete', onAnimationsComplete);
            animator.listen(this, 'progress', onAnimationProgress);
            this._initialize();
            if (this.attached) {
                this.update();
            }
        }
        get aspectRatio() {
            const {options: {aspectRatio, maintainAspectRatio}, width, height, _aspectRatio} = this;
            if (!isNullOrUndef(aspectRatio)) {
                return aspectRatio;
            }
            if (maintainAspectRatio && _aspectRatio) {
                return _aspectRatio;
            }
            return height ? width / height : null;
        }
        get data() {
            return this.config.data;
        }
        set data(data) {
            this.config.data = data;
        }
        get options() {
            return this._options;
        }
        set options(options) {
            this.config.options = options;
        }
        _initialize() {
            this.notifyPlugins('beforeInit');
            if (this.options.responsive) {
                this.resize();
            } else {
                retinaScale(this, this.options.devicePixelRatio);
            }
            this.bindEvents();
            this.notifyPlugins('afterInit');
            return this;
        }
        clear() {
            clearCanvas(this.canvas, this.ctx);
            return this;
        }
        stop() {
            animator.stop(this);
            return this;
        }
        resize(width, height) {
            if (!animator.running(this)) {
                this._resize(width, height);
            } else {
                this._resizeBeforeDraw = {width, height};
            }
        }
        _resize(width, height) {
            const options = this.options;
            const canvas = this.canvas;
            const aspectRatio = options.maintainAspectRatio && this.aspectRatio;
            const newSize = this.platform.getMaximumSize(canvas, width, height, aspectRatio);
            const newRatio = options.devicePixelRatio || this.platform.getDevicePixelRatio();
            const mode = this.width ? 'resize' : 'attach';
            this.width = newSize.width;
            this.height = newSize.height;
            this._aspectRatio = this.aspectRatio;
            if (!retinaScale(this, newRatio, true)) {
                return;
            }
            this.notifyPlugins('resize', {size: newSize});
            callback(options.onResize, [this, newSize], this);
            if (this.attached) {
                if (this._doResize(mode)) {
                    this.render();
                }
            }
        }
        ensureScalesHaveIDs() {
            const options = this.options;
            const scalesOptions = options.scales || {};
            each(scalesOptions, (axisOptions, axisID) => {
                axisOptions.id = axisID;
            });
        }
        buildOrUpdateScales() {
            const options = this.options;
            const scaleOpts = options.scales;
            const scales = this.scales;
            const updated = Object.keys(scales).reduce((obj, id) => {
                obj[id] = false;
                return obj;
            }, {});
            let items = [];
            if (scaleOpts) {
                items = items.concat(
                    Object.keys(scaleOpts).map((id) => {
                        const scaleOptions = scaleOpts[id];
                        const axis = determineAxis(id, scaleOptions);
                        const isRadial = axis === 'r';
                        const isHorizontal = axis === 'x';
                        return {
                            options: scaleOptions,
                            dposition: isRadial ? 'chartArea' : isHorizontal ? 'bottom' : 'left',
                            dtype: isRadial ? 'radialLinear' : isHorizontal ? 'category' : 'linear'
                        };
                    })
                );
            }
            each(items, (item) => {
                const scaleOptions = item.options;
                const id = scaleOptions.id;
                const axis = determineAxis(id, scaleOptions);
                const scaleType = valueOrDefault(scaleOptions.type, item.dtype);
                if (scaleOptions.position === undefined || positionIsHorizontal(scaleOptions.position, axis) !== positionIsHorizontal(item.dposition)) {
                    scaleOptions.position = item.dposition;
                }
                updated[id] = true;
                let scale = null;
                if (id in scales && scales[id].type === scaleType) {
                    scale = scales[id];
                } else {
                    const scaleClass = registry.getScale(scaleType);
                    scale = new scaleClass({
                        id,
                        type: scaleType,
                        ctx: this.ctx,
                        chart: this
                    });
                    scales[scale.id] = scale;
                }
                scale.init(scaleOptions, options);
            });
            each(updated, (hasUpdated, id) => {
                if (!hasUpdated) {
                    delete scales[id];
                }
            });
            each(scales, (scale) => {
                layouts.configure(this, scale, scale.options);
                layouts.addBox(this, scale);
            });
        }
        _updateMetasets() {
            const metasets = this._metasets;
            const numData = this.data.datasets.length;
            const numMeta = metasets.length;
            metasets.sort((a, b) => a.index - b.index);
            if (numMeta > numData) {
                for (let i = numData; i < numMeta; ++i) {
                    this._destroyDatasetMeta(i);
                }
                metasets.splice(numData, numMeta - numData);
            }
            this._sortedMetasets = metasets.slice(0).sort(compare2Level('order', 'index'));
        }
        _removeUnreferencedMetasets() {
            const {_metasets: metasets, data: {datasets}} = this;
            if (metasets.length > datasets.length) {
                delete this._stacks;
            }
            metasets.forEach((meta, index) => {
                if (datasets.filter(x => x === meta._dataset).length === 0) {
                    this._destroyDatasetMeta(index);
                }
            });
        }
        buildOrUpdateControllers() {
            const newControllers = [];
            const datasets = this.data.datasets;
            let i, ilen;
            this._removeUnreferencedMetasets();
            for (i = 0, ilen = datasets.length; i < ilen; i++) {
                const dataset = datasets[i];
                let meta = this.getDatasetMeta(i);
                const type = dataset.type || this.config.type;
                if (meta.type && meta.type !== type) {
                    this._destroyDatasetMeta(i);
                    meta = this.getDatasetMeta(i);
                }
                meta.type = type;
                meta.indexAxis = dataset.indexAxis || getIndexAxis(type, this.options);
                meta.order = dataset.order || 0;
                meta.index = i;
                meta.label = '' + dataset.label;
                meta.visible = this.isDatasetVisible(i);
                if (meta.controller) {
                    meta.controller.updateIndex(i);
                    meta.controller.linkScales();
                } else {
                    const ControllerClass = registry.getController(type);
                    const {datasetElementType, dataElementType} = defaults.datasets[type];
                    Object.assign(ControllerClass.prototype, {
                        dataElementType: registry.getElement(dataElementType),
                        datasetElementType: datasetElementType && registry.getElement(datasetElementType)
                    });
                    meta.controller = new ControllerClass(this, i);
                    newControllers.push(meta.controller);
                }
            }
            this._updateMetasets();
            return newControllers;
        }
        _resetElements() {
            each(this.data.datasets, (dataset, datasetIndex) => {
                this.getDatasetMeta(datasetIndex).controller.reset();
            }, this);
        }
        reset() {
            this._resetElements();
            this.notifyPlugins('reset');
        }
        update(mode) {
            const config = this.config;
            config.update();
            const options = this._options = config.createResolver(config.chartOptionScopes(), this.getContext());
            const animsDisabled = this._animationsDisabled = !options.animation;
            this._updateScales();
            this._checkEventBindings();
            this._updateHiddenIndices();
            this._plugins.invalidate();
            if (this.notifyPlugins('beforeUpdate', {mode, cancelable: true}) === false) {
                return;
            }
            const newControllers = this.buildOrUpdateControllers();
            this.notifyPlugins('beforeElementsUpdate');
            let minPadding = 0;
            for (let i = 0, ilen = this.data.datasets.length; i < ilen; i++) {
                const {controller} = this.getDatasetMeta(i);
                const reset = !animsDisabled && newControllers.indexOf(controller) === -1;
                controller.buildOrUpdateElements(reset);
                minPadding = Math.max(+controller.getMaxOverflow(), minPadding);
            }
            minPadding = this._minPadding = options.layout.autoPadding ? minPadding : 0;
            this._updateLayout(minPadding);
            if (!animsDisabled) {
                each(newControllers, (controller) => {
                    controller.reset();
                });
            }
            this._updateDatasets(mode);
            this.notifyPlugins('afterUpdate', {mode});
            this._layers.sort(compare2Level('z', '_idx'));
            const {_active, _lastEvent} = this;
            if (_lastEvent) {
                this._eventHandler(_lastEvent, true);
            } else if (_active.length) {
                this._updateHoverStyles(_active, _active, true);
            }
            this.render();
        }
        _updateScales() {
            each(this.scales, (scale) => {
                layouts.removeBox(this, scale);
            });
            this.ensureScalesHaveIDs();
            this.buildOrUpdateScales();
        }
        _checkEventBindings() {
            const options = this.options;
            const existingEvents = new Set(Object.keys(this._listeners));
            const newEvents = new Set(options.events);
            if (!setsEqual(existingEvents, newEvents) || !!this._responsiveListeners !== options.responsive) {
                this.unbindEvents();
                this.bindEvents();
            }
        }
        _updateHiddenIndices() {
            const {_hiddenIndices} = this;
            const changes = this._getUniformDataChanges() || [];
            for (const {method, start, count} of changes) {
                const move = method === '_removeElements' ? -count : count;
                moveNumericKeys(_hiddenIndices, start, move);
            }
        }
        _getUniformDataChanges() {
            const _dataChanges = this._dataChanges;
            if (!_dataChanges || !_dataChanges.length) {
                return;
            }
            this._dataChanges = [];
            const datasetCount = this.data.datasets.length;
            const makeSet = (idx) => new Set(
                _dataChanges
                    .filter(c => c[0] === idx)
                    .map((c, i) => i + ',' + c.splice(1).join(','))
            );
            const changeSet = makeSet(0);
            for (let i = 1; i < datasetCount; i++) {
                if (!setsEqual(changeSet, makeSet(i))) {
                    return;
                }
            }
            return Array.from(changeSet)
                .map(c => c.split(','))
                .map(a => ({method: a[1], start: +a[2], count: +a[3]}));
        }
        _updateLayout(minPadding) {
            if (this.notifyPlugins('beforeLayout', {cancelable: true}) === false) {
                return;
            }
            layouts.update(this, this.width, this.height, minPadding);
            const area = this.chartArea;
            const noArea = area.width <= 0 || area.height <= 0;
            this._layers = [];
            each(this.boxes, (box) => {
                if (noArea && box.position === 'chartArea') {
                    return;
                }
                if (box.configure) {
                    box.configure();
                }
                this._layers.push(...box._layers());
            }, this);
            this._layers.forEach((item, index) => {
                item._idx = index;
            });
            this.notifyPlugins('afterLayout');
        }
        _updateDatasets(mode) {
            if (this.notifyPlugins('beforeDatasetsUpdate', {mode, cancelable: true}) === false) {
                return;
            }
            for (let i = 0, ilen = this.data.datasets.length; i < ilen; ++i) {
                this.getDatasetMeta(i).controller.configure();
            }
            for (let i = 0, ilen = this.data.datasets.length; i < ilen; ++i) {
                this._updateDataset(i, isFunction(mode) ? mode({datasetIndex: i}) : mode);
            }
            this.notifyPlugins('afterDatasetsUpdate', {mode});
        }
        _updateDataset(index, mode) {
            const meta = this.getDatasetMeta(index);
            const args = {meta, index, mode, cancelable: true};
            if (this.notifyPlugins('beforeDatasetUpdate', args) === false) {
                return;
            }
            meta.controller._update(mode);
            args.cancelable = false;
            this.notifyPlugins('afterDatasetUpdate', args);
        }
        render() {
            if (this.notifyPlugins('beforeRender', {cancelable: true}) === false) {
                return;
            }
            if (animator.has(this)) {
                if (this.attached && !animator.running(this)) {
                    animator.start(this);
                }
            } else {
                this.draw();
                onAnimationsComplete({chart: this});
            }
        }
        draw() {
            let i;
            if (this._resizeBeforeDraw) {
                const {width, height} = this._resizeBeforeDraw;
                this._resize(width, height);
                this._resizeBeforeDraw = null;
            }
            this.clear();
            if (this.width <= 0 || this.height <= 0) {
                return;
            }
            if (this.notifyPlugins('beforeDraw', {cancelable: true}) === false) {
                return;
            }
            const layers = this._layers;
            for (i = 0; i < layers.length && layers[i].z <= 0; ++i) {
                layers[i].draw(this.chartArea);
            }
            this._drawDatasets();
            for (; i < layers.length; ++i) {
                layers[i].draw(this.chartArea);
            }
            this.notifyPlugins('afterDraw');
        }
        _getSortedDatasetMetas(filterVisible) {
            const metasets = this._sortedMetasets;
            const result = [];
            let i, ilen;
            for (i = 0, ilen = metasets.length; i < ilen; ++i) {
                const meta = metasets[i];
                if (!filterVisible || meta.visible) {
                    result.push(meta);
                }
            }
            return result;
        }
        getSortedVisibleDatasetMetas() {
            return this._getSortedDatasetMetas(true);
        }
        _drawDatasets() {
            if (this.notifyPlugins('beforeDatasetsDraw', {cancelable: true}) === false) {
                return;
            }
            const metasets = this.getSortedVisibleDatasetMetas();
            for (let i = metasets.length - 1; i >= 0; --i) {
                this._drawDataset(metasets[i]);
            }
            this.notifyPlugins('afterDatasetsDraw');
        }
        _drawDataset(meta) {
            const ctx = this.ctx;
            const clip = meta._clip;
            const useClip = !clip.disabled;
            const area = this.chartArea;
            const args = {
                meta,
                index: meta.index,
                cancelable: true
            };
            if (this.notifyPlugins('beforeDatasetDraw', args) === false) {
                return;
            }
            if (useClip) {
                clipArea(ctx, {
                    left: clip.left === false ? 0 : area.left - clip.left,
                    right: clip.right === false ? this.width : area.right + clip.right,
                    top: clip.top === false ? 0 : area.top - clip.top,
                    bottom: clip.bottom === false ? this.height : area.bottom + clip.bottom
                });
            }
            meta.controller.draw();
            if (useClip) {
                unclipArea(ctx);
            }
            args.cancelable = false;
            this.notifyPlugins('afterDatasetDraw', args);
        }
        isPointInArea(point) {
            return _isPointInArea(point, this.chartArea, this._minPadding);
        }
        getElementsAtEventForMode(e, mode, options, useFinalPosition) {
            const method = Interaction.modes[mode];
            if (typeof method === 'function') {
                return method(this, e, options, useFinalPosition);
            }
            return [];
        }
        getDatasetMeta(datasetIndex) {
            const dataset = this.data.datasets[datasetIndex];
            const metasets = this._metasets;
            let meta = metasets.filter(x => x && x._dataset === dataset).pop();
            if (!meta) {
                meta = {
                    type: null,
                    data: [],
                    dataset: null,
                    controller: null,
                    hidden: null,
                    xAxisID: null,
                    yAxisID: null,
                    order: dataset && dataset.order || 0,
                    index: datasetIndex,
                    _dataset: dataset,
                    _parsed: [],
                    _sorted: false
                };
                metasets.push(meta);
            }
            return meta;
        }
        getContext() {
            return this.$context || (this.$context = createContext(null, {chart: this, type: 'chart'}));
        }
        getVisibleDatasetCount() {
            return this.getSortedVisibleDatasetMetas().length;
        }
        isDatasetVisible(datasetIndex) {
            const dataset = this.data.datasets[datasetIndex];
            if (!dataset) {
                return false;
            }
            const meta = this.getDatasetMeta(datasetIndex);
            return typeof meta.hidden === 'boolean' ? !meta.hidden : !dataset.hidden;
        }
        setDatasetVisibility(datasetIndex, visible) {
            const meta = this.getDatasetMeta(datasetIndex);
            meta.hidden = !visible;
        }
        toggleDataVisibility(index) {
            this._hiddenIndices[index] = !this._hiddenIndices[index];
        }
        getDataVisibility(index) {
            return !this._hiddenIndices[index];
        }
        _updateVisibility(datasetIndex, dataIndex, visible) {
            const mode = visible ? 'show' : 'hide';
            const meta = this.getDatasetMeta(datasetIndex);
            const anims = meta.controller._resolveAnimations(undefined, mode);
            if (defined(dataIndex)) {
                meta.data[dataIndex].hidden = !visible;
                this.update();
            } else {
                this.setDatasetVisibility(datasetIndex, visible);
                anims.update(meta, {visible});
                this.update((ctx) => ctx.datasetIndex === datasetIndex ? mode : undefined);
            }
        }
        hide(datasetIndex, dataIndex) {
            this._updateVisibility(datasetIndex, dataIndex, false);
        }
        show(datasetIndex, dataIndex) {
            this._updateVisibility(datasetIndex, dataIndex, true);
        }
        _destroyDatasetMeta(datasetIndex) {
            const meta = this._metasets[datasetIndex];
            if (meta && meta.controller) {
                meta.controller._destroy();
            }
            delete this._metasets[datasetIndex];
        }
        _stop() {
            let i, ilen;
            this.stop();
            animator.remove(this);
            for (i = 0, ilen = this.data.datasets.length; i < ilen; ++i) {
                this._destroyDatasetMeta(i);
            }
        }
        destroy() {
            this.notifyPlugins('beforeDestroy');
            const {canvas, ctx} = this;
            this._stop();
            this.config.clearCache();
            if (canvas) {
                this.unbindEvents();
                clearCanvas(canvas, ctx);
                this.platform.releaseContext(ctx);
                this.canvas = null;
                this.ctx = null;
            }
            this.notifyPlugins('destroy');
            delete instances[this.id];
            this.notifyPlugins('afterDestroy');
        }
        toBase64Image(...args) {
            return this.canvas.toDataURL(...args);
        }
        bindEvents() {
            this.bindUserEvents();
            if (this.options.responsive) {
                this.bindResponsiveEvents();
            } else {
                this.attached = true;
            }
        }
        bindUserEvents() {
            const listeners = this._listeners;
            const platform = this.platform;
            const _add = (type, listener) => {
                platform.addEventListener(this, type, listener);
                listeners[type] = listener;
            };
            const listener = (e, x, y) => {
                e.offsetX = x;
                e.offsetY = y;
                this._eventHandler(e);
            };
            each(this.options.events, (type) => _add(type, listener));
        }
        bindResponsiveEvents() {
            if (!this._responsiveListeners) {
                this._responsiveListeners = {};
            }
            const listeners = this._responsiveListeners;
            const platform = this.platform;
            const _add = (type, listener) => {
                platform.addEventListener(this, type, listener);
                listeners[type] = listener;
            };
            const _remove = (type, listener) => {
                if (listeners[type]) {
                    platform.removeEventListener(this, type, listener);
                    delete listeners[type];
                }
            };
            const listener = (width, height) => {
                if (this.canvas) {
                    this.resize(width, height);
                }
            };
            let detached;
            const attached = () => {
                _remove('attach', attached);
                this.attached = true;
                this.resize();
                _add('resize', listener);
                _add('detach', detached);
            };
            detached = () => {
                this.attached = false;
                _remove('resize', listener);
                this._stop();
                this._resize(0, 0);
                _add('attach', attached);
            };
            if (platform.isAttached(this.canvas)) {
                attached();
            } else {
                detached();
            }
        }
        unbindEvents() {
            each(this._listeners, (listener, type) => {
                this.platform.removeEventListener(this, type, listener);
            });
            this._listeners = {};
            each(this._responsiveListeners, (listener, type) => {
                this.platform.removeEventListener(this, type, listener);
            });
            this._responsiveListeners = undefined;
        }
        updateHoverStyle(items, mode, enabled) {
            const prefix = enabled ? 'set' : 'remove';
            let meta, item, i, ilen;
            if (mode === 'dataset') {
                meta = this.getDatasetMeta(items[0].datasetIndex);
                meta.controller['_' + prefix + 'DatasetHoverStyle']();
            }
            for (i = 0, ilen = items.length; i < ilen; ++i) {
                item = items[i];
                const controller = item && this.getDatasetMeta(item.datasetIndex).controller;
                if (controller) {
                    controller[prefix + 'HoverStyle'](item.element, item.datasetIndex, item.index);
                }
            }
        }
        getActiveElements() {
            return this._active || [];
        }
        setActiveElements(activeElements) {
            const lastActive = this._active || [];
            const active = activeElements.map(({datasetIndex, index}) => {
                const meta = this.getDatasetMeta(datasetIndex);
                if (!meta) {
                    throw new Error('No dataset found at index ' + datasetIndex);
                }
                return {
                    datasetIndex,
                    element: meta.data[index],
                    index,
                };
            });
            const changed = !_elementsEqual(active, lastActive);
            if (changed) {
                this._active = active;
                this._lastEvent = null;
                this._updateHoverStyles(active, lastActive);
            }
        }
        notifyPlugins(hook, args, filter) {
            return this._plugins.notify(this, hook, args, filter);
        }
        _updateHoverStyles(active, lastActive, replay) {
            const hoverOptions = this.options.hover;
            const diff = (a, b) => a.filter(x => !b.some(y => x.datasetIndex === y.datasetIndex && x.index === y.index));
            const deactivated = diff(lastActive, active);
            const activated = replay ? active : diff(active, lastActive);
            if (deactivated.length) {
                this.updateHoverStyle(deactivated, hoverOptions.mode, false);
            }
            if (activated.length && hoverOptions.mode) {
                this.updateHoverStyle(activated, hoverOptions.mode, true);
            }
        }
        _eventHandler(e, replay) {
            const args = {
                event: e,
                replay,
                cancelable: true,
                inChartArea: this.isPointInArea(e)
            };
            const eventFilter = (plugin) => (plugin.options.events || this.options.events).includes(e.native.type);
            if (this.notifyPlugins('beforeEvent', args, eventFilter) === false) {
                return;
            }
            const changed = this._handleEvent(e, replay, args.inChartArea);
            args.cancelable = false;
            this.notifyPlugins('afterEvent', args, eventFilter);
            if (changed || args.changed) {
                this.render();
            }
            return this;
        }
        _handleEvent(e, replay, inChartArea) {
            const {_active: lastActive = [], options} = this;
            const useFinalPosition = replay;
            const active = this._getActiveElements(e, lastActive, inChartArea, useFinalPosition);
            const isClick = _isClickEvent(e);
            const lastEvent = determineLastEvent(e, this._lastEvent, inChartArea, isClick);
            if (inChartArea) {
                this._lastEvent = null;
                callback(options.onHover, [e, active, this], this);
                if (isClick) {
                    callback(options.onClick, [e, active, this], this);
                }
            }
            const changed = !_elementsEqual(active, lastActive);
            if (changed || replay) {
                this._active = active;
                this._updateHoverStyles(active, lastActive, replay);
            }
            this._lastEvent = lastEvent;
            return changed;
        }
        _getActiveElements(e, lastActive, inChartArea, useFinalPosition) {
            if (e.type === 'mouseout') {
                return [];
            }
            if (!inChartArea) {
                return lastActive;
            }
            const hoverOptions = this.options.hover;
            return this.getElementsAtEventForMode(e, hoverOptions.mode, hoverOptions, useFinalPosition);
        }
    }
    const invalidatePlugins = () => each(Chart.instances, (chart) => chart._plugins.invalidate());
    const enumerable = true;
    Object.defineProperties(Chart, {
        defaults: {
            enumerable,
            value: defaults
        },
        instances: {
            enumerable,
            value: instances
        },
        overrides: {
            enumerable,
            value: overrides
        },
        registry: {
            enumerable,
            value: registry
        },
        version: {
            enumerable,
            value: version
        },
        getChart: {
            enumerable,
            value: getChart
        },
        register: {
            enumerable,
            value: (...items) => {
                registry.add(...items);
                invalidatePlugins();
            }
        },
        unregister: {
            enumerable,
            value: (...items) => {
                registry.remove(...items);
                invalidatePlugins();
            }
        }
    });

    function abstract() {
        throw new Error('This method is not implemented: Check that a complete date adapter is provided.');
    }
    class DateAdapter {
        constructor(options) {
            this.options = options || {};
        }
        init(chartOptions) {}
        formats() {
            return abstract();
        }
        parse(value, format) {
            return abstract();
        }
        format(timestamp, format) {
            return abstract();
        }
        add(timestamp, amount, unit) {
            return abstract();
        }
        diff(a, b, unit) {
            return abstract();
        }
        startOf(timestamp, unit, weekday) {
            return abstract();
        }
        endOf(timestamp, unit) {
            return abstract();
        }
    }
    DateAdapter.override = function(members) {
        Object.assign(DateAdapter.prototype, members);
    };
    var _adapters = {
        _date: DateAdapter
    };

    function getAllScaleValues(scale, type) {
        if (!scale._cache.$bar) {
            const visibleMetas = scale.getMatchingVisibleMetas(type);
            let values = [];
            for (let i = 0, ilen = visibleMetas.length; i < ilen; i++) {
                values = values.concat(visibleMetas[i].controller.getAllParsedValues(scale));
            }
            scale._cache.$bar = _arrayUnique(values.sort((a, b) => a - b));
        }
        return scale._cache.$bar;
    }
    function computeMinSampleSize(meta) {
        const scale = meta.iScale;
        const values = getAllScaleValues(scale, meta.type);
        let min = scale._length;
        let i, ilen, curr, prev;
        const updateMinAndPrev = () => {
            if (curr === 32767 || curr === -32768) {
                return;
            }
            if (defined(prev)) {
                min = Math.min(min, Math.abs(curr - prev) || min);
            }
            prev = curr;
        };
        for (i = 0, ilen = values.length; i < ilen; ++i) {
            curr = scale.getPixelForValue(values[i]);
            updateMinAndPrev();
        }
        prev = undefined;
        for (i = 0, ilen = scale.ticks.length; i < ilen; ++i) {
            curr = scale.getPixelForTick(i);
            updateMinAndPrev();
        }
        return min;
    }
    function computeFitCategoryTraits(index, ruler, options, stackCount) {
        const thickness = options.barThickness;
        let size, ratio;
        if (isNullOrUndef(thickness)) {
            size = ruler.min * options.categoryPercentage;
            ratio = options.barPercentage;
        } else {
            size = thickness * stackCount;
            ratio = 1;
        }
        return {
            chunk: size / stackCount,
            ratio,
            start: ruler.pixels[index] - (size / 2)
        };
    }
    function computeFlexCategoryTraits(index, ruler, options, stackCount) {
        const pixels = ruler.pixels;
        const curr = pixels[index];
        let prev = index > 0 ? pixels[index - 1] : null;
        let next = index < pixels.length - 1 ? pixels[index + 1] : null;
        const percent = options.categoryPercentage;
        if (prev === null) {
            prev = curr - (next === null ? ruler.end - ruler.start : next - curr);
        }
        if (next === null) {
            next = curr + curr - prev;
        }
        const start = curr - (curr - Math.min(prev, next)) / 2 * percent;
        const size = Math.abs(next - prev) / 2 * percent;
        return {
            chunk: size / stackCount,
            ratio: options.barPercentage,
            start
        };
    }
    function parseFloatBar(entry, item, vScale, i) {
        const startValue = vScale.parse(entry[0], i);
        const endValue = vScale.parse(entry[1], i);
        const min = Math.min(startValue, endValue);
        const max = Math.max(startValue, endValue);
        let barStart = min;
        let barEnd = max;
        if (Math.abs(min) > Math.abs(max)) {
            barStart = max;
            barEnd = min;
        }
        item[vScale.axis] = barEnd;
        item._custom = {
            barStart,
            barEnd,
            start: startValue,
            end: endValue,
            min,
            max
        };
    }
    function parseValue(entry, item, vScale, i) {
        if (isArray(entry)) {
            parseFloatBar(entry, item, vScale, i);
        } else {
            item[vScale.axis] = vScale.parse(entry, i);
        }
        return item;
    }
    function parseArrayOrPrimitive(meta, data, start, count) {
        const iScale = meta.iScale;
        const vScale = meta.vScale;
        const labels = iScale.getLabels();
        const singleScale = iScale === vScale;
        const parsed = [];
        let i, ilen, item, entry;
        for (i = start, ilen = start + count; i < ilen; ++i) {
            entry = data[i];
            item = {};
            item[iScale.axis] = singleScale || iScale.parse(labels[i], i);
            parsed.push(parseValue(entry, item, vScale, i));
        }
        return parsed;
    }
    function isFloatBar(custom) {
        return custom && custom.barStart !== undefined && custom.barEnd !== undefined;
    }
    function barSign(size, vScale, actualBase) {
        if (size !== 0) {
            return sign(size);
        }
        return (vScale.isHorizontal() ? 1 : -1) * (vScale.min >= actualBase ? 1 : -1);
    }
    function borderProps(properties) {
        let reverse, start, end, top, bottom;
        if (properties.horizontal) {
            reverse = properties.base > properties.x;
            start = 'left';
            end = 'right';
        } else {
            reverse = properties.base < properties.y;
            start = 'bottom';
            end = 'top';
        }
        if (reverse) {
            top = 'end';
            bottom = 'start';
        } else {
            top = 'start';
            bottom = 'end';
        }
        return {start, end, reverse, top, bottom};
    }
    function setBorderSkipped(properties, options, stack, index) {
        let edge = options.borderSkipped;
        const res = {};
        if (!edge) {
            properties.borderSkipped = res;
            return;
        }
        if (edge === true) {
            properties.borderSkipped = {top: true, right: true, bottom: true, left: true};
            return;
        }
        const {start, end, reverse, top, bottom} = borderProps(properties);
        if (edge === 'middle' && stack) {
            properties.enableBorderRadius = true;
            if ((stack._top || 0) === index) {
                edge = top;
            } else if ((stack._bottom || 0) === index) {
                edge = bottom;
            } else {
                res[parseEdge(bottom, start, end, reverse)] = true;
                edge = top;
            }
        }
        res[parseEdge(edge, start, end, reverse)] = true;
        properties.borderSkipped = res;
    }
    function parseEdge(edge, a, b, reverse) {
        if (reverse) {
            edge = swap(edge, a, b);
            edge = startEnd(edge, b, a);
        } else {
            edge = startEnd(edge, a, b);
        }
        return edge;
    }
    function swap(orig, v1, v2) {
        return orig === v1 ? v2 : orig === v2 ? v1 : orig;
    }
    function startEnd(v, start, end) {
        return v === 'start' ? start : v === 'end' ? end : v;
    }
    function setInflateAmount(properties, {inflateAmount}, ratio) {
        properties.inflateAmount = inflateAmount === 'auto'
            ? ratio === 1 ? 0.33 : 0
            : inflateAmount;
    }
    class BarController extends DatasetController {
        parsePrimitiveData(meta, data, start, count) {
            return parseArrayOrPrimitive(meta, data, start, count);
        }
        parseArrayData(meta, data, start, count) {
            return parseArrayOrPrimitive(meta, data, start, count);
        }
        parseObjectData(meta, data, start, count) {
            const {iScale, vScale} = meta;
            const {xAxisKey = 'x', yAxisKey = 'y'} = this._parsing;
            const iAxisKey = iScale.axis === 'x' ? xAxisKey : yAxisKey;
            const vAxisKey = vScale.axis === 'x' ? xAxisKey : yAxisKey;
            const parsed = [];
            let i, ilen, item, obj;
            for (i = start, ilen = start + count; i < ilen; ++i) {
                obj = data[i];
                item = {};
                item[iScale.axis] = iScale.parse(resolveObjectKey(obj, iAxisKey), i);
                parsed.push(parseValue(resolveObjectKey(obj, vAxisKey), item, vScale, i));
            }
            return parsed;
        }
        updateRangeFromParsed(range, scale, parsed, stack) {
            super.updateRangeFromParsed(range, scale, parsed, stack);
            const custom = parsed._custom;
            if (custom && scale === this._cachedMeta.vScale) {
                range.min = Math.min(range.min, custom.min);
                range.max = Math.max(range.max, custom.max);
            }
        }
        getMaxOverflow() {
            return 0;
        }
        getLabelAndValue(index) {
            const meta = this._cachedMeta;
            const {iScale, vScale} = meta;
            const parsed = this.getParsed(index);
            const custom = parsed._custom;
            const value = isFloatBar(custom)
                ? '[' + custom.start + ', ' + custom.end + ']'
                : '' + vScale.getLabelForValue(parsed[vScale.axis]);
            return {
                label: '' + iScale.getLabelForValue(parsed[iScale.axis]),
                value
            };
        }
        initialize() {
            this.enableOptionSharing = true;
            super.initialize();
            const meta = this._cachedMeta;
            meta.stack = this.getDataset().stack;
        }
        update(mode) {
            const meta = this._cachedMeta;
            this.updateElements(meta.data, 0, meta.data.length, mode);
        }
        updateElements(bars, start, count, mode) {
            const reset = mode === 'reset';
            const {index, _cachedMeta: {vScale}} = this;
            const base = vScale.getBasePixel();
            const horizontal = vScale.isHorizontal();
            const ruler = this._getRuler();
            const {sharedOptions, includeOptions} = this._getSharedOptions(start, mode);
            for (let i = start; i < start + count; i++) {
                const parsed = this.getParsed(i);
                const vpixels = reset || isNullOrUndef(parsed[vScale.axis]) ? {base, head: base} : this._calculateBarValuePixels(i);
                const ipixels = this._calculateBarIndexPixels(i, ruler);
                const stack = (parsed._stacks || {})[vScale.axis];
                const properties = {
                    horizontal,
                    base: vpixels.base,
                    enableBorderRadius: !stack || isFloatBar(parsed._custom) || (index === stack._top || index === stack._bottom),
                    x: horizontal ? vpixels.head : ipixels.center,
                    y: horizontal ? ipixels.center : vpixels.head,
                    height: horizontal ? ipixels.size : Math.abs(vpixels.size),
                    width: horizontal ? Math.abs(vpixels.size) : ipixels.size
                };
                if (includeOptions) {
                    properties.options = sharedOptions || this.resolveDataElementOptions(i, bars[i].active ? 'active' : mode);
                }
                const options = properties.options || bars[i].options;
                setBorderSkipped(properties, options, stack, index);
                setInflateAmount(properties, options, ruler.ratio);
                this.updateElement(bars[i], i, properties, mode);
            }
        }
        _getStacks(last, dataIndex) {
            const {iScale} = this._cachedMeta;
            const metasets = iScale.getMatchingVisibleMetas(this._type)
                .filter(meta => meta.controller.options.grouped);
            const stacked = iScale.options.stacked;
            const stacks = [];
            const skipNull = (meta) => {
                const parsed = meta.controller.getParsed(dataIndex);
                const val = parsed && parsed[meta.vScale.axis];
                if (isNullOrUndef(val) || isNaN(val)) {
                    return true;
                }
            };
            for (const meta of metasets) {
                if (dataIndex !== undefined && skipNull(meta)) {
                    continue;
                }
                if (stacked === false || stacks.indexOf(meta.stack) === -1 ||
                    (stacked === undefined && meta.stack === undefined)) {
                    stacks.push(meta.stack);
                }
                if (meta.index === last) {
                    break;
                }
            }
            if (!stacks.length) {
                stacks.push(undefined);
            }
            return stacks;
        }
        _getStackCount(index) {
            return this._getStacks(undefined, index).length;
        }
        _getStackIndex(datasetIndex, name, dataIndex) {
            const stacks = this._getStacks(datasetIndex, dataIndex);
            const index = (name !== undefined)
                ? stacks.indexOf(name)
                : -1;
            return (index === -1)
                ? stacks.length - 1
                : index;
        }
        _getRuler() {
            const opts = this.options;
            const meta = this._cachedMeta;
            const iScale = meta.iScale;
            const pixels = [];
            let i, ilen;
            for (i = 0, ilen = meta.data.length; i < ilen; ++i) {
                pixels.push(iScale.getPixelForValue(this.getParsed(i)[iScale.axis], i));
            }
            const barThickness = opts.barThickness;
            const min = barThickness || computeMinSampleSize(meta);
            return {
                min,
                pixels,
                start: iScale._startPixel,
                end: iScale._endPixel,
                stackCount: this._getStackCount(),
                scale: iScale,
                grouped: opts.grouped,
                ratio: barThickness ? 1 : opts.categoryPercentage * opts.barPercentage
            };
        }
        _calculateBarValuePixels(index) {
            const {_cachedMeta: {vScale, _stacked}, options: {base: baseValue, minBarLength}} = this;
            const actualBase = baseValue || 0;
            const parsed = this.getParsed(index);
            const custom = parsed._custom;
            const floating = isFloatBar(custom);
            let value = parsed[vScale.axis];
            let start = 0;
            let length = _stacked ? this.applyStack(vScale, parsed, _stacked) : value;
            let head, size;
            if (length !== value) {
                start = length - value;
                length = value;
            }
            if (floating) {
                value = custom.barStart;
                length = custom.barEnd - custom.barStart;
                if (value !== 0 && sign(value) !== sign(custom.barEnd)) {
                    start = 0;
                }
                start += value;
            }
            const startValue = !isNullOrUndef(baseValue) && !floating ? baseValue : start;
            let base = vScale.getPixelForValue(startValue);
            if (this.chart.getDataVisibility(index)) {
                head = vScale.getPixelForValue(start + length);
            } else {
                head = base;
            }
            size = head - base;
            if (Math.abs(size) < minBarLength) {
                size = barSign(size, vScale, actualBase) * minBarLength;
                if (value === actualBase) {
                    base -= size / 2;
                }
                const startPixel = vScale.getPixelForDecimal(0);
                const endPixel = vScale.getPixelForDecimal(1);
                const min = Math.min(startPixel, endPixel);
                const max = Math.max(startPixel, endPixel);
                base = Math.max(Math.min(base, max), min);
                head = base + size;
            }
            if (base === vScale.getPixelForValue(actualBase)) {
                const halfGrid = sign(size) * vScale.getLineWidthForValue(actualBase) / 2;
                base += halfGrid;
                size -= halfGrid;
            }
            return {
                size,
                base,
                head,
                center: head + size / 2
            };
        }
        _calculateBarIndexPixels(index, ruler) {
            const scale = ruler.scale;
            const options = this.options;
            const skipNull = options.skipNull;
            const maxBarThickness = valueOrDefault(options.maxBarThickness, Infinity);
            let center, size;
            if (ruler.grouped) {
                const stackCount = skipNull ? this._getStackCount(index) : ruler.stackCount;
                const range = options.barThickness === 'flex'
                    ? computeFlexCategoryTraits(index, ruler, options, stackCount)
                    : computeFitCategoryTraits(index, ruler, options, stackCount);
                const stackIndex = this._getStackIndex(this.index, this._cachedMeta.stack, skipNull ? index : undefined);
                center = range.start + (range.chunk * stackIndex) + (range.chunk / 2);
                size = Math.min(maxBarThickness, range.chunk * range.ratio);
            } else {
                center = scale.getPixelForValue(this.getParsed(index)[scale.axis], index);
                size = Math.min(maxBarThickness, ruler.min * ruler.ratio);
            }
            return {
                base: center - size / 2,
                head: center + size / 2,
                center,
                size
            };
        }
        draw() {
            const meta = this._cachedMeta;
            const vScale = meta.vScale;
            const rects = meta.data;
            const ilen = rects.length;
            let i = 0;
            for (; i < ilen; ++i) {
                if (this.getParsed(i)[vScale.axis] !== null) {
                    rects[i].draw(this._ctx);
                }
            }
        }
    }
    BarController.id = 'bar';
    BarController.defaults = {
        datasetElementType: false,
        dataElementType: 'bar',
        categoryPercentage: 0.8,
        barPercentage: 0.9,
        grouped: true,
        animations: {
            numbers: {
                type: 'number',
                properties: ['x', 'y', 'base', 'width', 'height']
            }
        }
    };
    BarController.overrides = {
        scales: {
            _index_: {
                type: 'category',
                offset: true,
                grid: {
                    offset: true
                }
            },
            _value_: {
                type: 'linear',
                beginAtZero: true,
            }
        }
    };

    class BubbleController extends DatasetController {
        initialize() {
            this.enableOptionSharing = true;
            super.initialize();
        }
        parsePrimitiveData(meta, data, start, count) {
            const parsed = super.parsePrimitiveData(meta, data, start, count);
            for (let i = 0; i < parsed.length; i++) {
                parsed[i]._custom = this.resolveDataElementOptions(i + start).radius;
            }
            return parsed;
        }
        parseArrayData(meta, data, start, count) {
            const parsed = super.parseArrayData(meta, data, start, count);
            for (let i = 0; i < parsed.length; i++) {
                const item = data[start + i];
                parsed[i]._custom = valueOrDefault(item[2], this.resolveDataElementOptions(i + start).radius);
            }
            return parsed;
        }
        parseObjectData(meta, data, start, count) {
            const parsed = super.parseObjectData(meta, data, start, count);
            for (let i = 0; i < parsed.length; i++) {
                const item = data[start + i];
                parsed[i]._custom = valueOrDefault(item && item.r && +item.r, this.resolveDataElementOptions(i + start).radius);
            }
            return parsed;
        }
        getMaxOverflow() {
            const data = this._cachedMeta.data;
            let max = 0;
            for (let i = data.length - 1; i >= 0; --i) {
                max = Math.max(max, data[i].size(this.resolveDataElementOptions(i)) / 2);
            }
            return max > 0 && max;
        }
        getLabelAndValue(index) {
            const meta = this._cachedMeta;
            const {xScale, yScale} = meta;
            const parsed = this.getParsed(index);
            const x = xScale.getLabelForValue(parsed.x);
            const y = yScale.getLabelForValue(parsed.y);
            const r = parsed._custom;
            return {
                label: meta.label,
                value: '(' + x + ', ' + y + (r ? ', ' + r : '') + ')'
            };
        }
        update(mode) {
            const points = this._cachedMeta.data;
            this.updateElements(points, 0, points.length, mode);
        }
        updateElements(points, start, count, mode) {
            const reset = mode === 'reset';
            const {iScale, vScale} = this._cachedMeta;
            const {sharedOptions, includeOptions} = this._getSharedOptions(start, mode);
            const iAxis = iScale.axis;
            const vAxis = vScale.axis;
            for (let i = start; i < start + count; i++) {
                const point = points[i];
                const parsed = !reset && this.getParsed(i);
                const properties = {};
                const iPixel = properties[iAxis] = reset ? iScale.getPixelForDecimal(0.5) : iScale.getPixelForValue(parsed[iAxis]);
                const vPixel = properties[vAxis] = reset ? vScale.getBasePixel() : vScale.getPixelForValue(parsed[vAxis]);
                properties.skip = isNaN(iPixel) || isNaN(vPixel);
                if (includeOptions) {
                    properties.options = sharedOptions || this.resolveDataElementOptions(i, point.active ? 'active' : mode);
                    if (reset) {
                        properties.options.radius = 0;
                    }
                }
                this.updateElement(point, i, properties, mode);
            }
        }
        resolveDataElementOptions(index, mode) {
            const parsed = this.getParsed(index);
            let values = super.resolveDataElementOptions(index, mode);
            if (values.$shared) {
                values = Object.assign({}, values, {$shared: false});
            }
            const radius = values.radius;
            if (mode !== 'active') {
                values.radius = 0;
            }
            values.radius += valueOrDefault(parsed && parsed._custom, radius);
            return values;
        }
    }
    BubbleController.id = 'bubble';
    BubbleController.defaults = {
        datasetElementType: false,
        dataElementType: 'point',
        animations: {
            numbers: {
                type: 'number',
                properties: ['x', 'y', 'borderWidth', 'radius']
            }
        }
    };
    BubbleController.overrides = {
        scales: {
            x: {
                type: 'linear'
            },
            y: {
                type: 'linear'
            }
        },
        plugins: {
            tooltip: {
                callbacks: {
                    title() {
                        return '';
                    }
                }
            }
        }
    };

    function getRatioAndOffset(rotation, circumference, cutout) {
        let ratioX = 1;
        let ratioY = 1;
        let offsetX = 0;
        let offsetY = 0;
        if (circumference < TAU) {
            const startAngle = rotation;
            const endAngle = startAngle + circumference;
            const startX = Math.cos(startAngle);
            const startY = Math.sin(startAngle);
            const endX = Math.cos(endAngle);
            const endY = Math.sin(endAngle);
            const calcMax = (angle, a, b) => _angleBetween(angle, startAngle, endAngle, true) ? 1 : Math.max(a, a * cutout, b, b * cutout);
            const calcMin = (angle, a, b) => _angleBetween(angle, startAngle, endAngle, true) ? -1 : Math.min(a, a * cutout, b, b * cutout);
            const maxX = calcMax(0, startX, endX);
            const maxY = calcMax(HALF_PI, startY, endY);
            const minX = calcMin(PI, startX, endX);
            const minY = calcMin(PI + HALF_PI, startY, endY);
            ratioX = (maxX - minX) / 2;
            ratioY = (maxY - minY) / 2;
            offsetX = -(maxX + minX) / 2;
            offsetY = -(maxY + minY) / 2;
        }
        return {ratioX, ratioY, offsetX, offsetY};
    }
    class DoughnutController extends DatasetController {
        constructor(chart, datasetIndex) {
            super(chart, datasetIndex);
            this.enableOptionSharing = true;
            this.innerRadius = undefined;
            this.outerRadius = undefined;
            this.offsetX = undefined;
            this.offsetY = undefined;
        }
        linkScales() {}
        parse(start, count) {
            const data = this.getDataset().data;
            const meta = this._cachedMeta;
            if (this._parsing === false) {
                meta._parsed = data;
            } else {
                let getter = (i) => +data[i];
                if (isObject(data[start])) {
                    const {key = 'value'} = this._parsing;
                    getter = (i) => +resolveObjectKey(data[i], key);
                }
                let i, ilen;
                for (i = start, ilen = start + count; i < ilen; ++i) {
                    meta._parsed[i] = getter(i);
                }
            }
        }
        _getRotation() {
            return toRadians(this.options.rotation - 90);
        }
        _getCircumference() {
            return toRadians(this.options.circumference);
        }
        _getRotationExtents() {
            let min = TAU;
            let max = -TAU;
            for (let i = 0; i < this.chart.data.datasets.length; ++i) {
                if (this.chart.isDatasetVisible(i)) {
                    const controller = this.chart.getDatasetMeta(i).controller;
                    const rotation = controller._getRotation();
                    const circumference = controller._getCircumference();
                    min = Math.min(min, rotation);
                    max = Math.max(max, rotation + circumference);
                }
            }
            return {
                rotation: min,
                circumference: max - min,
            };
        }
        update(mode) {
            const chart = this.chart;
            const {chartArea} = chart;
            const meta = this._cachedMeta;
            const arcs = meta.data;
            const spacing = this.getMaxBorderWidth() + this.getMaxOffset(arcs) + this.options.spacing;
            const maxSize = Math.max((Math.min(chartArea.width, chartArea.height) - spacing) / 2, 0);
            const cutout = Math.min(toPercentage(this.options.cutout, maxSize), 1);
            const chartWeight = this._getRingWeight(this.index);
            const {circumference, rotation} = this._getRotationExtents();
            const {ratioX, ratioY, offsetX, offsetY} = getRatioAndOffset(rotation, circumference, cutout);
            const maxWidth = (chartArea.width - spacing) / ratioX;
            const maxHeight = (chartArea.height - spacing) / ratioY;
            const maxRadius = Math.max(Math.min(maxWidth, maxHeight) / 2, 0);
            const outerRadius = toDimension(this.options.radius, maxRadius);
            const innerRadius = Math.max(outerRadius * cutout, 0);
            const radiusLength = (outerRadius - innerRadius) / this._getVisibleDatasetWeightTotal();
            this.offsetX = offsetX * outerRadius;
            this.offsetY = offsetY * outerRadius;
            meta.total = this.calculateTotal();
            this.outerRadius = outerRadius - radiusLength * this._getRingWeightOffset(this.index);
            this.innerRadius = Math.max(this.outerRadius - radiusLength * chartWeight, 0);
            this.updateElements(arcs, 0, arcs.length, mode);
        }
        _circumference(i, reset) {
            const opts = this.options;
            const meta = this._cachedMeta;
            const circumference = this._getCircumference();
            if ((reset && opts.animation.animateRotate) || !this.chart.getDataVisibility(i) || meta._parsed[i] === null || meta.data[i].hidden) {
                return 0;
            }
            return this.calculateCircumference(meta._parsed[i] * circumference / TAU);
        }
        updateElements(arcs, start, count, mode) {
            const reset = mode === 'reset';
            const chart = this.chart;
            const chartArea = chart.chartArea;
            const opts = chart.options;
            const animationOpts = opts.animation;
            const centerX = (chartArea.left + chartArea.right) / 2;
            const centerY = (chartArea.top + chartArea.bottom) / 2;
            const animateScale = reset && animationOpts.animateScale;
            const innerRadius = animateScale ? 0 : this.innerRadius;
            const outerRadius = animateScale ? 0 : this.outerRadius;
            const {sharedOptions, includeOptions} = this._getSharedOptions(start, mode);
            let startAngle = this._getRotation();
            let i;
            for (i = 0; i < start; ++i) {
                startAngle += this._circumference(i, reset);
            }
            for (i = start; i < start + count; ++i) {
                const circumference = this._circumference(i, reset);
                const arc = arcs[i];
                const properties = {
                    x: centerX + this.offsetX,
                    y: centerY + this.offsetY,
                    startAngle,
                    endAngle: startAngle + circumference,
                    circumference,
                    outerRadius,
                    innerRadius
                };
                if (includeOptions) {
                    properties.options = sharedOptions || this.resolveDataElementOptions(i, arc.active ? 'active' : mode);
                }
                startAngle += circumference;
                this.updateElement(arc, i, properties, mode);
            }
        }
        calculateTotal() {
            const meta = this._cachedMeta;
            const metaData = meta.data;
            let total = 0;
            let i;
            for (i = 0; i < metaData.length; i++) {
                const value = meta._parsed[i];
                if (value !== null && !isNaN(value) && this.chart.getDataVisibility(i) && !metaData[i].hidden) {
                    total += Math.abs(value);
                }
            }
            return total;
        }
        calculateCircumference(value) {
            const total = this._cachedMeta.total;
            if (total > 0 && !isNaN(value)) {
                return TAU * (Math.abs(value) / total);
            }
            return 0;
        }
        getLabelAndValue(index) {
            const meta = this._cachedMeta;
            const chart = this.chart;
            const labels = chart.data.labels || [];
            const value = formatNumber(meta._parsed[index], chart.options.locale);
            return {
                label: labels[index] || '',
                value,
            };
        }
        getMaxBorderWidth(arcs) {
            let max = 0;
            const chart = this.chart;
            let i, ilen, meta, controller, options;
            if (!arcs) {
                for (i = 0, ilen = chart.data.datasets.length; i < ilen; ++i) {
                    if (chart.isDatasetVisible(i)) {
                        meta = chart.getDatasetMeta(i);
                        arcs = meta.data;
                        controller = meta.controller;
                        break;
                    }
                }
            }
            if (!arcs) {
                return 0;
            }
            for (i = 0, ilen = arcs.length; i < ilen; ++i) {
                options = controller.resolveDataElementOptions(i);
                if (options.borderAlign !== 'inner') {
                    max = Math.max(max, options.borderWidth || 0, options.hoverBorderWidth || 0);
                }
            }
            return max;
        }
        getMaxOffset(arcs) {
            let max = 0;
            for (let i = 0, ilen = arcs.length; i < ilen; ++i) {
                const options = this.resolveDataElementOptions(i);
                max = Math.max(max, options.offset || 0, options.hoverOffset || 0);
            }
            return max;
        }
        _getRingWeightOffset(datasetIndex) {
            let ringWeightOffset = 0;
            for (let i = 0; i < datasetIndex; ++i) {
                if (this.chart.isDatasetVisible(i)) {
                    ringWeightOffset += this._getRingWeight(i);
                }
            }
            return ringWeightOffset;
        }
        _getRingWeight(datasetIndex) {
            return Math.max(valueOrDefault(this.chart.data.datasets[datasetIndex].weight, 1), 0);
        }
        _getVisibleDatasetWeightTotal() {
            return this._getRingWeightOffset(this.chart.data.datasets.length) || 1;
        }
    }
    DoughnutController.id = 'doughnut';
    DoughnutController.defaults = {
        datasetElementType: false,
        dataElementType: 'arc',
        animation: {
            animateRotate: true,
            animateScale: false
        },
        animations: {
            numbers: {
                type: 'number',
                properties: ['circumference', 'endAngle', 'innerRadius', 'outerRadius', 'startAngle', 'x', 'y', 'offset', 'borderWidth', 'spacing']
            },
        },
        cutout: '50%',
        rotation: 0,
        circumference: 360,
        radius: '100%',
        spacing: 0,
        indexAxis: 'r',
    };
    DoughnutController.descriptors = {
        _scriptable: (name) => name !== 'spacing',
        _indexable: (name) => name !== 'spacing',
    };
    DoughnutController.overrides = {
        aspectRatio: 1,
        plugins: {
            legend: {
                labels: {
                    generateLabels(chart) {
                        const data = chart.data;
                        if (data.labels.length && data.datasets.length) {
                            const {labels: {pointStyle}} = chart.legend.options;
                            return data.labels.map((label, i) => {
                                const meta = chart.getDatasetMeta(0);
                                const style = meta.controller.getStyle(i);
                                return {
                                    text: label,
                                    fillStyle: style.backgroundColor,
                                    strokeStyle: style.borderColor,
                                    lineWidth: style.borderWidth,
                                    pointStyle: pointStyle,
                                    hidden: !chart.getDataVisibility(i),
                                    index: i
                                };
                            });
                        }
                        return [];
                    }
                },
                onClick(e, legendItem, legend) {
                    legend.chart.toggleDataVisibility(legendItem.index);
                    legend.chart.update();
                }
            },
            tooltip: {
                callbacks: {
                    title() {
                        return '';
                    },
                    label(tooltipItem) {
                        let dataLabel = tooltipItem.label;
                        const value = ': ' + tooltipItem.formattedValue;
                        if (isArray(dataLabel)) {
                            dataLabel = dataLabel.slice();
                            dataLabel[0] += value;
                        } else {
                            dataLabel += value;
                        }
                        return dataLabel;
                    }
                }
            }
        }
    };

    class LineController extends DatasetController {
        initialize() {
            this.enableOptionSharing = true;
            this.supportsDecimation = true;
            super.initialize();
        }
        update(mode) {
            const meta = this._cachedMeta;
            const {dataset: line, data: points = [], _dataset} = meta;
            const animationsDisabled = this.chart._animationsDisabled;
            let {start, count} = _getStartAndCountOfVisiblePoints(meta, points, animationsDisabled);
            this._drawStart = start;
            this._drawCount = count;
            if (_scaleRangesChanged(meta)) {
                start = 0;
                count = points.length;
            }
            line._chart = this.chart;
            line._datasetIndex = this.index;
            line._decimated = !!_dataset._decimated;
            line.points = points;
            const options = this.resolveDatasetElementOptions(mode);
            if (!this.options.showLine) {
                options.borderWidth = 0;
            }
            options.segment = this.options.segment;
            this.updateElement(line, undefined, {
                animated: !animationsDisabled,
                options
            }, mode);
            this.updateElements(points, start, count, mode);
        }
        updateElements(points, start, count, mode) {
            const reset = mode === 'reset';
            const {iScale, vScale, _stacked, _dataset} = this._cachedMeta;
            const {sharedOptions, includeOptions} = this._getSharedOptions(start, mode);
            const iAxis = iScale.axis;
            const vAxis = vScale.axis;
            const {spanGaps, segment} = this.options;
            const maxGapLength = isNumber(spanGaps) ? spanGaps : Number.POSITIVE_INFINITY;
            const directUpdate = this.chart._animationsDisabled || reset || mode === 'none';
            let prevParsed = start > 0 && this.getParsed(start - 1);
            for (let i = start; i < start + count; ++i) {
                const point = points[i];
                const parsed = this.getParsed(i);
                const properties = directUpdate ? point : {};
                const nullData = isNullOrUndef(parsed[vAxis]);
                const iPixel = properties[iAxis] = iScale.getPixelForValue(parsed[iAxis], i);
                const vPixel = properties[vAxis] = reset || nullData ? vScale.getBasePixel() : vScale.getPixelForValue(_stacked ? this.applyStack(vScale, parsed, _stacked) : parsed[vAxis], i);
                properties.skip = isNaN(iPixel) || isNaN(vPixel) || nullData;
                properties.stop = i > 0 && (Math.abs(parsed[iAxis] - prevParsed[iAxis])) > maxGapLength;
                if (segment) {
                    properties.parsed = parsed;
                    properties.raw = _dataset.data[i];
                }
                if (includeOptions) {
                    properties.options = sharedOptions || this.resolveDataElementOptions(i, point.active ? 'active' : mode);
                }
                if (!directUpdate) {
                    this.updateElement(point, i, properties, mode);
                }
                prevParsed = parsed;
            }
        }
        getMaxOverflow() {
            const meta = this._cachedMeta;
            const dataset = meta.dataset;
            const border = dataset.options && dataset.options.borderWidth || 0;
            const data = meta.data || [];
            if (!data.length) {
                return border;
            }
            const firstPoint = data[0].size(this.resolveDataElementOptions(0));
            const lastPoint = data[data.length - 1].size(this.resolveDataElementOptions(data.length - 1));
            return Math.max(border, firstPoint, lastPoint) / 2;
        }
        draw() {
            const meta = this._cachedMeta;
            meta.dataset.updateControlPoints(this.chart.chartArea, meta.iScale.axis);
            super.draw();
        }
    }
    LineController.id = 'line';
    LineController.defaults = {
        datasetElementType: 'line',
        dataElementType: 'point',
        showLine: true,
        spanGaps: false,
    };
    LineController.overrides = {
        scales: {
            _index_: {
                type: 'category',
            },
            _value_: {
                type: 'linear',
            },
        }
    };

    class PolarAreaController extends DatasetController {
        constructor(chart, datasetIndex) {
            super(chart, datasetIndex);
            this.innerRadius = undefined;
            this.outerRadius = undefined;
        }
        getLabelAndValue(index) {
            const meta = this._cachedMeta;
            const chart = this.chart;
            const labels = chart.data.labels || [];
            const value = formatNumber(meta._parsed[index].r, chart.options.locale);
            return {
                label: labels[index] || '',
                value,
            };
        }
        parseObjectData(meta, data, start, count) {
            return _parseObjectDataRadialScale.bind(this)(meta, data, start, count);
        }
        update(mode) {
            const arcs = this._cachedMeta.data;
            this._updateRadius();
            this.updateElements(arcs, 0, arcs.length, mode);
        }
        getMinMax() {
            const meta = this._cachedMeta;
            const range = {min: Number.POSITIVE_INFINITY, max: Number.NEGATIVE_INFINITY};
            meta.data.forEach((element, index) => {
                const parsed = this.getParsed(index).r;
                if (!isNaN(parsed) && this.chart.getDataVisibility(index)) {
                    if (parsed < range.min) {
                        range.min = parsed;
                    }
                    if (parsed > range.max) {
                        range.max = parsed;
                    }
                }
            });
            return range;
        }
        _updateRadius() {
            const chart = this.chart;
            const chartArea = chart.chartArea;
            const opts = chart.options;
            const minSize = Math.min(chartArea.right - chartArea.left, chartArea.bottom - chartArea.top);
            const outerRadius = Math.max(minSize / 2, 0);
            const innerRadius = Math.max(opts.cutoutPercentage ? (outerRadius / 100) * (opts.cutoutPercentage) : 1, 0);
            const radiusLength = (outerRadius - innerRadius) / chart.getVisibleDatasetCount();
            this.outerRadius = outerRadius - (radiusLength * this.index);
            this.innerRadius = this.outerRadius - radiusLength;
        }
        updateElements(arcs, start, count, mode) {
            const reset = mode === 'reset';
            const chart = this.chart;
            const opts = chart.options;
            const animationOpts = opts.animation;
            const scale = this._cachedMeta.rScale;
            const centerX = scale.xCenter;
            const centerY = scale.yCenter;
            const datasetStartAngle = scale.getIndexAngle(0) - 0.5 * PI;
            let angle = datasetStartAngle;
            let i;
            const defaultAngle = 360 / this.countVisibleElements();
            for (i = 0; i < start; ++i) {
                angle += this._computeAngle(i, mode, defaultAngle);
            }
            for (i = start; i < start + count; i++) {
                const arc = arcs[i];
                let startAngle = angle;
                let endAngle = angle + this._computeAngle(i, mode, defaultAngle);
                let outerRadius = chart.getDataVisibility(i) ? scale.getDistanceFromCenterForValue(this.getParsed(i).r) : 0;
                angle = endAngle;
                if (reset) {
                    if (animationOpts.animateScale) {
                        outerRadius = 0;
                    }
                    if (animationOpts.animateRotate) {
                        startAngle = endAngle = datasetStartAngle;
                    }
                }
                const properties = {
                    x: centerX,
                    y: centerY,
                    innerRadius: 0,
                    outerRadius,
                    startAngle,
                    endAngle,
                    options: this.resolveDataElementOptions(i, arc.active ? 'active' : mode)
                };
                this.updateElement(arc, i, properties, mode);
            }
        }
        countVisibleElements() {
            const meta = this._cachedMeta;
            let count = 0;
            meta.data.forEach((element, index) => {
                if (!isNaN(this.getParsed(index).r) && this.chart.getDataVisibility(index)) {
                    count++;
                }
            });
            return count;
        }
        _computeAngle(index, mode, defaultAngle) {
            return this.chart.getDataVisibility(index)
                ? toRadians(this.resolveDataElementOptions(index, mode).angle || defaultAngle)
                : 0;
        }
    }
    PolarAreaController.id = 'polarArea';
    PolarAreaController.defaults = {
        dataElementType: 'arc',
        animation: {
            animateRotate: true,
            animateScale: true
        },
        animations: {
            numbers: {
                type: 'number',
                properties: ['x', 'y', 'startAngle', 'endAngle', 'innerRadius', 'outerRadius']
            },
        },
        indexAxis: 'r',
        startAngle: 0,
    };
    PolarAreaController.overrides = {
        aspectRatio: 1,
        plugins: {
            legend: {
                labels: {
                    generateLabels(chart) {
                        const data = chart.data;
                        if (data.labels.length && data.datasets.length) {
                            const {labels: {pointStyle}} = chart.legend.options;
                            return data.labels.map((label, i) => {
                                const meta = chart.getDatasetMeta(0);
                                const style = meta.controller.getStyle(i);
                                return {
                                    text: label,
                                    fillStyle: style.backgroundColor,
                                    strokeStyle: style.borderColor,
                                    lineWidth: style.borderWidth,
                                    pointStyle: pointStyle,
                                    hidden: !chart.getDataVisibility(i),
                                    index: i
                                };
                            });
                        }
                        return [];
                    }
                },
                onClick(e, legendItem, legend) {
                    legend.chart.toggleDataVisibility(legendItem.index);
                    legend.chart.update();
                }
            },
            tooltip: {
                callbacks: {
                    title() {
                        return '';
                    },
                    label(context) {
                        return context.chart.data.labels[context.dataIndex] + ': ' + context.formattedValue;
                    }
                }
            }
        },
        scales: {
            r: {
                type: 'radialLinear',
                angleLines: {
                    display: false
                },
                beginAtZero: true,
                grid: {
                    circular: true
                },
                pointLabels: {
                    display: false
                },
                startAngle: 0
            }
        }
    };

    class PieController extends DoughnutController {
    }
    PieController.id = 'pie';
    PieController.defaults = {
        cutout: 0,
        rotation: 0,
        circumference: 360,
        radius: '100%'
    };

    class RadarController extends DatasetController {
        getLabelAndValue(index) {
            const vScale = this._cachedMeta.vScale;
            const parsed = this.getParsed(index);
            return {
                label: vScale.getLabels()[index],
                value: '' + vScale.getLabelForValue(parsed[vScale.axis])
            };
        }
        parseObjectData(meta, data, start, count) {
            return _parseObjectDataRadialScale.bind(this)(meta, data, start, count);
        }
        update(mode) {
            const meta = this._cachedMeta;
            const line = meta.dataset;
            const points = meta.data || [];
            const labels = meta.iScale.getLabels();
            line.points = points;
            if (mode !== 'resize') {
                const options = this.resolveDatasetElementOptions(mode);
                if (!this.options.showLine) {
                    options.borderWidth = 0;
                }
                const properties = {
                    _loop: true,
                    _fullLoop: labels.length === points.length,
                    options
                };
                this.updateElement(line, undefined, properties, mode);
            }
            this.updateElements(points, 0, points.length, mode);
        }
        updateElements(points, start, count, mode) {
            const scale = this._cachedMeta.rScale;
            const reset = mode === 'reset';
            for (let i = start; i < start + count; i++) {
                const point = points[i];
                const options = this.resolveDataElementOptions(i, point.active ? 'active' : mode);
                const pointPosition = scale.getPointPositionForValue(i, this.getParsed(i).r);
                const x = reset ? scale.xCenter : pointPosition.x;
                const y = reset ? scale.yCenter : pointPosition.y;
                const properties = {
                    x,
                    y,
                    angle: pointPosition.angle,
                    skip: isNaN(x) || isNaN(y),
                    options
                };
                this.updateElement(point, i, properties, mode);
            }
        }
    }
    RadarController.id = 'radar';
    RadarController.defaults = {
        datasetElementType: 'line',
        dataElementType: 'point',
        indexAxis: 'r',
        showLine: true,
        elements: {
            line: {
                fill: 'start'
            }
        },
    };
    RadarController.overrides = {
        aspectRatio: 1,
        scales: {
            r: {
                type: 'radialLinear',
            }
        }
    };

    class ScatterController extends DatasetController {
        update(mode) {
            const meta = this._cachedMeta;
            const {data: points = []} = meta;
            const animationsDisabled = this.chart._animationsDisabled;
            let {start, count} = _getStartAndCountOfVisiblePoints(meta, points, animationsDisabled);
            this._drawStart = start;
            this._drawCount = count;
            if (_scaleRangesChanged(meta)) {
                start = 0;
                count = points.length;
            }
            if (this.options.showLine) {
                const {dataset: line, _dataset} = meta;
                line._chart = this.chart;
                line._datasetIndex = this.index;
                line._decimated = !!_dataset._decimated;
                line.points = points;
                const options = this.resolveDatasetElementOptions(mode);
                options.segment = this.options.segment;
                this.updateElement(line, undefined, {
                    animated: !animationsDisabled,
                    options
                }, mode);
            }
            this.updateElements(points, start, count, mode);
        }
        addElements() {
            const {showLine} = this.options;
            if (!this.datasetElementType && showLine) {
                this.datasetElementType = registry.getElement('line');
            }
            super.addElements();
        }
        updateElements(points, start, count, mode) {
            const reset = mode === 'reset';
            const {iScale, vScale, _stacked, _dataset} = this._cachedMeta;
            const firstOpts = this.resolveDataElementOptions(start, mode);
            const sharedOptions = this.getSharedOptions(firstOpts);
            const includeOptions = this.includeOptions(mode, sharedOptions);
            const iAxis = iScale.axis;
            const vAxis = vScale.axis;
            const {spanGaps, segment} = this.options;
            const maxGapLength = isNumber(spanGaps) ? spanGaps : Number.POSITIVE_INFINITY;
            const directUpdate = this.chart._animationsDisabled || reset || mode === 'none';
            let prevParsed = start > 0 && this.getParsed(start - 1);
            for (let i = start; i < start + count; ++i) {
                const point = points[i];
                const parsed = this.getParsed(i);
                const properties = directUpdate ? point : {};
                const nullData = isNullOrUndef(parsed[vAxis]);
                const iPixel = properties[iAxis] = iScale.getPixelForValue(parsed[iAxis], i);
                const vPixel = properties[vAxis] = reset || nullData ? vScale.getBasePixel() : vScale.getPixelForValue(_stacked ? this.applyStack(vScale, parsed, _stacked) : parsed[vAxis], i);
                properties.skip = isNaN(iPixel) || isNaN(vPixel) || nullData;
                properties.stop = i > 0 && (Math.abs(parsed[iAxis] - prevParsed[iAxis])) > maxGapLength;
                if (segment) {
                    properties.parsed = parsed;
                    properties.raw = _dataset.data[i];
                }
                if (includeOptions) {
                    properties.options = sharedOptions || this.resolveDataElementOptions(i, point.active ? 'active' : mode);
                }
                if (!directUpdate) {
                    this.updateElement(point, i, properties, mode);
                }
                prevParsed = parsed;
            }
            this.updateSharedOptions(sharedOptions, mode, firstOpts);
        }
        getMaxOverflow() {
            const meta = this._cachedMeta;
            const data = meta.data || [];
            if (!this.options.showLine) {
                let max = 0;
                for (let i = data.length - 1; i >= 0; --i) {
                    max = Math.max(max, data[i].size(this.resolveDataElementOptions(i)) / 2);
                }
                return max > 0 && max;
            }
            const dataset = meta.dataset;
            const border = dataset.options && dataset.options.borderWidth || 0;
            if (!data.length) {
                return border;
            }
            const firstPoint = data[0].size(this.resolveDataElementOptions(0));
            const lastPoint = data[data.length - 1].size(this.resolveDataElementOptions(data.length - 1));
            return Math.max(border, firstPoint, lastPoint) / 2;
        }
    }
    ScatterController.id = 'scatter';
    ScatterController.defaults = {
        datasetElementType: false,
        dataElementType: 'point',
        showLine: false,
        fill: false
    };
    ScatterController.overrides = {
        interaction: {
            mode: 'point'
        },
        plugins: {
            tooltip: {
                callbacks: {
                    title() {
                        return '';
                    },
                    label(item) {
                        return '(' + item.label + ', ' + item.formattedValue + ')';
                    }
                }
            }
        },
        scales: {
            x: {
                type: 'linear'
            },
            y: {
                type: 'linear'
            }
        }
    };

    var controllers = /*#__PURE__*/Object.freeze({
        __proto__: null,
        BarController: BarController,
        BubbleController: BubbleController,
        DoughnutController: DoughnutController,
        LineController: LineController,
        PolarAreaController: PolarAreaController,
        PieController: PieController,
        RadarController: RadarController,
        ScatterController: ScatterController
    });

    function clipArc(ctx, element, endAngle) {
        const {startAngle, pixelMargin, x, y, outerRadius, innerRadius} = element;
        let angleMargin = pixelMargin / outerRadius;
        ctx.beginPath();
        ctx.arc(x, y, outerRadius, startAngle - angleMargin, endAngle + angleMargin);
        if (innerRadius > pixelMargin) {
            angleMargin = pixelMargin / innerRadius;
            ctx.arc(x, y, innerRadius, endAngle + angleMargin, startAngle - angleMargin, true);
        } else {
            ctx.arc(x, y, pixelMargin, endAngle + HALF_PI, startAngle - HALF_PI);
        }
        ctx.closePath();
        ctx.clip();
    }
    function toRadiusCorners(value) {
        return _readValueToProps(value, ['outerStart', 'outerEnd', 'innerStart', 'innerEnd']);
    }
    function parseBorderRadius$1(arc, innerRadius, outerRadius, angleDelta) {
        const o = toRadiusCorners(arc.options.borderRadius);
        const halfThickness = (outerRadius - innerRadius) / 2;
        const innerLimit = Math.min(halfThickness, angleDelta * innerRadius / 2);
        const computeOuterLimit = (val) => {
            const outerArcLimit = (outerRadius - Math.min(halfThickness, val)) * angleDelta / 2;
            return _limitValue(val, 0, Math.min(halfThickness, outerArcLimit));
        };
        return {
            outerStart: computeOuterLimit(o.outerStart),
            outerEnd: computeOuterLimit(o.outerEnd),
            innerStart: _limitValue(o.innerStart, 0, innerLimit),
            innerEnd: _limitValue(o.innerEnd, 0, innerLimit),
        };
    }
    function rThetaToXY(r, theta, x, y) {
        return {
            x: x + r * Math.cos(theta),
            y: y + r * Math.sin(theta),
        };
    }
    function pathArc(ctx, element, offset, spacing, end, circular) {
        const {x, y, startAngle: start, pixelMargin, innerRadius: innerR} = element;
        const outerRadius = Math.max(element.outerRadius + spacing + offset - pixelMargin, 0);
        const innerRadius = innerR > 0 ? innerR + spacing + offset + pixelMargin : 0;
        let spacingOffset = 0;
        const alpha = end - start;
        if (spacing) {
            const noSpacingInnerRadius = innerR > 0 ? innerR - spacing : 0;
            const noSpacingOuterRadius = outerRadius > 0 ? outerRadius - spacing : 0;
            const avNogSpacingRadius = (noSpacingInnerRadius + noSpacingOuterRadius) / 2;
            const adjustedAngle = avNogSpacingRadius !== 0 ? (alpha * avNogSpacingRadius) / (avNogSpacingRadius + spacing) : alpha;
            spacingOffset = (alpha - adjustedAngle) / 2;
        }
        const beta = Math.max(0.001, alpha * outerRadius - offset / PI) / outerRadius;
        const angleOffset = (alpha - beta) / 2;
        const startAngle = start + angleOffset + spacingOffset;
        const endAngle = end - angleOffset - spacingOffset;
        const {outerStart, outerEnd, innerStart, innerEnd} = parseBorderRadius$1(element, innerRadius, outerRadius, endAngle - startAngle);
        const outerStartAdjustedRadius = outerRadius - outerStart;
        const outerEndAdjustedRadius = outerRadius - outerEnd;
        const outerStartAdjustedAngle = startAngle + outerStart / outerStartAdjustedRadius;
        const outerEndAdjustedAngle = endAngle - outerEnd / outerEndAdjustedRadius;
        const innerStartAdjustedRadius = innerRadius + innerStart;
        const innerEndAdjustedRadius = innerRadius + innerEnd;
        const innerStartAdjustedAngle = startAngle + innerStart / innerStartAdjustedRadius;
        const innerEndAdjustedAngle = endAngle - innerEnd / innerEndAdjustedRadius;
        ctx.beginPath();
        if (circular) {
            ctx.arc(x, y, outerRadius, outerStartAdjustedAngle, outerEndAdjustedAngle);
            if (outerEnd > 0) {
                const pCenter = rThetaToXY(outerEndAdjustedRadius, outerEndAdjustedAngle, x, y);
                ctx.arc(pCenter.x, pCenter.y, outerEnd, outerEndAdjustedAngle, endAngle + HALF_PI);
            }
            const p4 = rThetaToXY(innerEndAdjustedRadius, endAngle, x, y);
            ctx.lineTo(p4.x, p4.y);
            if (innerEnd > 0) {
                const pCenter = rThetaToXY(innerEndAdjustedRadius, innerEndAdjustedAngle, x, y);
                ctx.arc(pCenter.x, pCenter.y, innerEnd, endAngle + HALF_PI, innerEndAdjustedAngle + Math.PI);
            }
            ctx.arc(x, y, innerRadius, endAngle - (innerEnd / innerRadius), startAngle + (innerStart / innerRadius), true);
            if (innerStart > 0) {
                const pCenter = rThetaToXY(innerStartAdjustedRadius, innerStartAdjustedAngle, x, y);
                ctx.arc(pCenter.x, pCenter.y, innerStart, innerStartAdjustedAngle + Math.PI, startAngle - HALF_PI);
            }
            const p8 = rThetaToXY(outerStartAdjustedRadius, startAngle, x, y);
            ctx.lineTo(p8.x, p8.y);
            if (outerStart > 0) {
                const pCenter = rThetaToXY(outerStartAdjustedRadius, outerStartAdjustedAngle, x, y);
                ctx.arc(pCenter.x, pCenter.y, outerStart, startAngle - HALF_PI, outerStartAdjustedAngle);
            }
        } else {
            ctx.moveTo(x, y);
            const outerStartX = Math.cos(outerStartAdjustedAngle) * outerRadius + x;
            const outerStartY = Math.sin(outerStartAdjustedAngle) * outerRadius + y;
            ctx.lineTo(outerStartX, outerStartY);
            const outerEndX = Math.cos(outerEndAdjustedAngle) * outerRadius + x;
            const outerEndY = Math.sin(outerEndAdjustedAngle) * outerRadius + y;
            ctx.lineTo(outerEndX, outerEndY);
        }
        ctx.closePath();
    }
    function drawArc(ctx, element, offset, spacing, circular) {
        const {fullCircles, startAngle, circumference} = element;
        let endAngle = element.endAngle;
        if (fullCircles) {
            pathArc(ctx, element, offset, spacing, startAngle + TAU, circular);
            for (let i = 0; i < fullCircles; ++i) {
                ctx.fill();
            }
            if (!isNaN(circumference)) {
                endAngle = startAngle + circumference % TAU;
                if (circumference % TAU === 0) {
                    endAngle += TAU;
                }
            }
        }
        pathArc(ctx, element, offset, spacing, endAngle, circular);
        ctx.fill();
        return endAngle;
    }
    function drawFullCircleBorders(ctx, element, inner) {
        const {x, y, startAngle, pixelMargin, fullCircles} = element;
        const outerRadius = Math.max(element.outerRadius - pixelMargin, 0);
        const innerRadius = element.innerRadius + pixelMargin;
        let i;
        if (inner) {
            clipArc(ctx, element, startAngle + TAU);
        }
        ctx.beginPath();
        ctx.arc(x, y, innerRadius, startAngle + TAU, startAngle, true);
        for (i = 0; i < fullCircles; ++i) {
            ctx.stroke();
        }
        ctx.beginPath();
        ctx.arc(x, y, outerRadius, startAngle, startAngle + TAU);
        for (i = 0; i < fullCircles; ++i) {
            ctx.stroke();
        }
    }
    function drawBorder(ctx, element, offset, spacing, endAngle, circular) {
        const {options} = element;
        const {borderWidth, borderJoinStyle} = options;
        const inner = options.borderAlign === 'inner';
        if (!borderWidth) {
            return;
        }
        if (inner) {
            ctx.lineWidth = borderWidth * 2;
            ctx.lineJoin = borderJoinStyle || 'round';
        } else {
            ctx.lineWidth = borderWidth;
            ctx.lineJoin = borderJoinStyle || 'bevel';
        }
        if (element.fullCircles) {
            drawFullCircleBorders(ctx, element, inner);
        }
        if (inner) {
            clipArc(ctx, element, endAngle);
        }
        pathArc(ctx, element, offset, spacing, endAngle, circular);
        ctx.stroke();
    }
    class ArcElement extends Element {
        constructor(cfg) {
            super();
            this.options = undefined;
            this.circumference = undefined;
            this.startAngle = undefined;
            this.endAngle = undefined;
            this.innerRadius = undefined;
            this.outerRadius = undefined;
            this.pixelMargin = 0;
            this.fullCircles = 0;
            if (cfg) {
                Object.assign(this, cfg);
            }
        }
        inRange(chartX, chartY, useFinalPosition) {
            const point = this.getProps(['x', 'y'], useFinalPosition);
            const {angle, distance} = getAngleFromPoint(point, {x: chartX, y: chartY});
            const {startAngle, endAngle, innerRadius, outerRadius, circumference} = this.getProps([
                'startAngle',
                'endAngle',
                'innerRadius',
                'outerRadius',
                'circumference'
            ], useFinalPosition);
            const rAdjust = this.options.spacing / 2;
            const _circumference = valueOrDefault(circumference, endAngle - startAngle);
            const betweenAngles = _circumference >= TAU || _angleBetween(angle, startAngle, endAngle);
            const withinRadius = _isBetween(distance, innerRadius + rAdjust, outerRadius + rAdjust);
            return (betweenAngles && withinRadius);
        }
        getCenterPoint(useFinalPosition) {
            const {x, y, startAngle, endAngle, innerRadius, outerRadius} = this.getProps([
                'x',
                'y',
                'startAngle',
                'endAngle',
                'innerRadius',
                'outerRadius',
                'circumference',
            ], useFinalPosition);
            const {offset, spacing} = this.options;
            const halfAngle = (startAngle + endAngle) / 2;
            const halfRadius = (innerRadius + outerRadius + spacing + offset) / 2;
            return {
                x: x + Math.cos(halfAngle) * halfRadius,
                y: y + Math.sin(halfAngle) * halfRadius
            };
        }
        tooltipPosition(useFinalPosition) {
            return this.getCenterPoint(useFinalPosition);
        }
        draw(ctx) {
            const {options, circumference} = this;
            const offset = (options.offset || 0) / 2;
            const spacing = (options.spacing || 0) / 2;
            const circular = options.circular;
            this.pixelMargin = (options.borderAlign === 'inner') ? 0.33 : 0;
            this.fullCircles = circumference > TAU ? Math.floor(circumference / TAU) : 0;
            if (circumference === 0 || this.innerRadius < 0 || this.outerRadius < 0) {
                return;
            }
            ctx.save();
            let radiusOffset = 0;
            if (offset) {
                radiusOffset = offset / 2;
                const halfAngle = (this.startAngle + this.endAngle) / 2;
                ctx.translate(Math.cos(halfAngle) * radiusOffset, Math.sin(halfAngle) * radiusOffset);
                if (this.circumference >= PI) {
                    radiusOffset = offset;
                }
            }
            ctx.fillStyle = options.backgroundColor;
            ctx.strokeStyle = options.borderColor;
            const endAngle = drawArc(ctx, this, radiusOffset, spacing, circular);
            drawBorder(ctx, this, radiusOffset, spacing, endAngle, circular);
            ctx.restore();
        }
    }
    ArcElement.id = 'arc';
    ArcElement.defaults = {
        borderAlign: 'center',
        borderColor: '#fff',
        borderJoinStyle: undefined,
        borderRadius: 0,
        borderWidth: 2,
        offset: 0,
        spacing: 0,
        angle: undefined,
        circular: true,
    };
    ArcElement.defaultRoutes = {
        backgroundColor: 'backgroundColor'
    };

    function setStyle(ctx, options, style = options) {
        ctx.lineCap = valueOrDefault(style.borderCapStyle, options.borderCapStyle);
        ctx.setLineDash(valueOrDefault(style.borderDash, options.borderDash));
        ctx.lineDashOffset = valueOrDefault(style.borderDashOffset, options.borderDashOffset);
        ctx.lineJoin = valueOrDefault(style.borderJoinStyle, options.borderJoinStyle);
        ctx.lineWidth = valueOrDefault(style.borderWidth, options.borderWidth);
        ctx.strokeStyle = valueOrDefault(style.borderColor, options.borderColor);
    }
    function lineTo(ctx, previous, target) {
        ctx.lineTo(target.x, target.y);
    }
    function getLineMethod(options) {
        if (options.stepped) {
            return _steppedLineTo;
        }
        if (options.tension || options.cubicInterpolationMode === 'monotone') {
            return _bezierCurveTo;
        }
        return lineTo;
    }
    function pathVars(points, segment, params = {}) {
        const count = points.length;
        const {start: paramsStart = 0, end: paramsEnd = count - 1} = params;
        const {start: segmentStart, end: segmentEnd} = segment;
        const start = Math.max(paramsStart, segmentStart);
        const end = Math.min(paramsEnd, segmentEnd);
        const outside = paramsStart < segmentStart && paramsEnd < segmentStart || paramsStart > segmentEnd && paramsEnd > segmentEnd;
        return {
            count,
            start,
            loop: segment.loop,
            ilen: end < start && !outside ? count + end - start : end - start
        };
    }
    function pathSegment(ctx, line, segment, params) {
        const {points, options} = line;
        const {count, start, loop, ilen} = pathVars(points, segment, params);
        const lineMethod = getLineMethod(options);
        let {move = true, reverse} = params || {};
        let i, point, prev;
        for (i = 0; i <= ilen; ++i) {
            point = points[(start + (reverse ? ilen - i : i)) % count];
            if (point.skip) {
                continue;
            } else if (move) {
                ctx.moveTo(point.x, point.y);
                move = false;
            } else {
                lineMethod(ctx, prev, point, reverse, options.stepped);
            }
            prev = point;
        }
        if (loop) {
            point = points[(start + (reverse ? ilen : 0)) % count];
            lineMethod(ctx, prev, point, reverse, options.stepped);
        }
        return !!loop;
    }
    function fastPathSegment(ctx, line, segment, params) {
        const points = line.points;
        const {count, start, ilen} = pathVars(points, segment, params);
        const {move = true, reverse} = params || {};
        let avgX = 0;
        let countX = 0;
        let i, point, prevX, minY, maxY, lastY;
        const pointIndex = (index) => (start + (reverse ? ilen - index : index)) % count;
        const drawX = () => {
            if (minY !== maxY) {
                ctx.lineTo(avgX, maxY);
                ctx.lineTo(avgX, minY);
                ctx.lineTo(avgX, lastY);
            }
        };
        if (move) {
            point = points[pointIndex(0)];
            ctx.moveTo(point.x, point.y);
        }
        for (i = 0; i <= ilen; ++i) {
            point = points[pointIndex(i)];
            if (point.skip) {
                continue;
            }
            const x = point.x;
            const y = point.y;
            const truncX = x | 0;
            if (truncX === prevX) {
                if (y < minY) {
                    minY = y;
                } else if (y > maxY) {
                    maxY = y;
                }
                avgX = (countX * avgX + x) / ++countX;
            } else {
                drawX();
                ctx.lineTo(x, y);
                prevX = truncX;
                countX = 0;
                minY = maxY = y;
            }
            lastY = y;
        }
        drawX();
    }
    function _getSegmentMethod(line) {
        const opts = line.options;
        const borderDash = opts.borderDash && opts.borderDash.length;
        const useFastPath = !line._decimated && !line._loop && !opts.tension && opts.cubicInterpolationMode !== 'monotone' && !opts.stepped && !borderDash;
        return useFastPath ? fastPathSegment : pathSegment;
    }
    function _getInterpolationMethod(options) {
        if (options.stepped) {
            return _steppedInterpolation;
        }
        if (options.tension || options.cubicInterpolationMode === 'monotone') {
            return _bezierInterpolation;
        }
        return _pointInLine;
    }
    function strokePathWithCache(ctx, line, start, count) {
        let path = line._path;
        if (!path) {
            path = line._path = new Path2D();
            if (line.path(path, start, count)) {
                path.closePath();
            }
        }
        setStyle(ctx, line.options);
        ctx.stroke(path);
    }
    function strokePathDirect(ctx, line, start, count) {
        const {segments, options} = line;
        const segmentMethod = _getSegmentMethod(line);
        for (const segment of segments) {
            setStyle(ctx, options, segment.style);
            ctx.beginPath();
            if (segmentMethod(ctx, line, segment, {start, end: start + count - 1})) {
                ctx.closePath();
            }
            ctx.stroke();
        }
    }
    const usePath2D = typeof Path2D === 'function';
    function draw(ctx, line, start, count) {
        if (usePath2D && !line.options.segment) {
            strokePathWithCache(ctx, line, start, count);
        } else {
            strokePathDirect(ctx, line, start, count);
        }
    }
    class LineElement extends Element {
        constructor(cfg) {
            super();
            this.animated = true;
            this.options = undefined;
            this._chart = undefined;
            this._loop = undefined;
            this._fullLoop = undefined;
            this._path = undefined;
            this._points = undefined;
            this._segments = undefined;
            this._decimated = false;
            this._pointsUpdated = false;
            this._datasetIndex = undefined;
            if (cfg) {
                Object.assign(this, cfg);
            }
        }
        updateControlPoints(chartArea, indexAxis) {
            const options = this.options;
            if ((options.tension || options.cubicInterpolationMode === 'monotone') && !options.stepped && !this._pointsUpdated) {
                const loop = options.spanGaps ? this._loop : this._fullLoop;
                _updateBezierControlPoints(this._points, options, chartArea, loop, indexAxis);
                this._pointsUpdated = true;
            }
        }
        set points(points) {
            this._points = points;
            delete this._segments;
            delete this._path;
            this._pointsUpdated = false;
        }
        get points() {
            return this._points;
        }
        get segments() {
            return this._segments || (this._segments = _computeSegments(this, this.options.segment));
        }
        first() {
            const segments = this.segments;
            const points = this.points;
            return segments.length && points[segments[0].start];
        }
        last() {
            const segments = this.segments;
            const points = this.points;
            const count = segments.length;
            return count && points[segments[count - 1].end];
        }
        interpolate(point, property) {
            const options = this.options;
            const value = point[property];
            const points = this.points;
            const segments = _boundSegments(this, {property, start: value, end: value});
            if (!segments.length) {
                return;
            }
            const result = [];
            const _interpolate = _getInterpolationMethod(options);
            let i, ilen;
            for (i = 0, ilen = segments.length; i < ilen; ++i) {
                const {start, end} = segments[i];
                const p1 = points[start];
                const p2 = points[end];
                if (p1 === p2) {
                    result.push(p1);
                    continue;
                }
                const t = Math.abs((value - p1[property]) / (p2[property] - p1[property]));
                const interpolated = _interpolate(p1, p2, t, options.stepped);
                interpolated[property] = point[property];
                result.push(interpolated);
            }
            return result.length === 1 ? result[0] : result;
        }
        pathSegment(ctx, segment, params) {
            const segmentMethod = _getSegmentMethod(this);
            return segmentMethod(ctx, this, segment, params);
        }
        path(ctx, start, count) {
            const segments = this.segments;
            const segmentMethod = _getSegmentMethod(this);
            let loop = this._loop;
            start = start || 0;
            count = count || (this.points.length - start);
            for (const segment of segments) {
                loop &= segmentMethod(ctx, this, segment, {start, end: start + count - 1});
            }
            return !!loop;
        }
        draw(ctx, chartArea, start, count) {
            const options = this.options || {};
            const points = this.points || [];
            if (points.length && options.borderWidth) {
                ctx.save();
                draw(ctx, this, start, count);
                ctx.restore();
            }
            if (this.animated) {
                this._pointsUpdated = false;
                this._path = undefined;
            }
        }
    }
    LineElement.id = 'line';
    LineElement.defaults = {
        borderCapStyle: 'butt',
        borderDash: [],
        borderDashOffset: 0,
        borderJoinStyle: 'miter',
        borderWidth: 3,
        capBezierPoints: true,
        cubicInterpolationMode: 'default',
        fill: false,
        spanGaps: false,
        stepped: false,
        tension: 0,
    };
    LineElement.defaultRoutes = {
        backgroundColor: 'backgroundColor',
        borderColor: 'borderColor'
    };
    LineElement.descriptors = {
        _scriptable: true,
        _indexable: (name) => name !== 'borderDash' && name !== 'fill',
    };

    function inRange$1(el, pos, axis, useFinalPosition) {
        const options = el.options;
        const {[axis]: value} = el.getProps([axis], useFinalPosition);
        return (Math.abs(pos - value) < options.radius + options.hitRadius);
    }
    class PointElement extends Element {
        constructor(cfg) {
            super();
            this.options = undefined;
            this.parsed = undefined;
            this.skip = undefined;
            this.stop = undefined;
            if (cfg) {
                Object.assign(this, cfg);
            }
        }
        inRange(mouseX, mouseY, useFinalPosition) {
            const options = this.options;
            const {x, y} = this.getProps(['x', 'y'], useFinalPosition);
            return ((Math.pow(mouseX - x, 2) + Math.pow(mouseY - y, 2)) < Math.pow(options.hitRadius + options.radius, 2));
        }
        inXRange(mouseX, useFinalPosition) {
            return inRange$1(this, mouseX, 'x', useFinalPosition);
        }
        inYRange(mouseY, useFinalPosition) {
            return inRange$1(this, mouseY, 'y', useFinalPosition);
        }
        getCenterPoint(useFinalPosition) {
            const {x, y} = this.getProps(['x', 'y'], useFinalPosition);
            return {x, y};
        }
        size(options) {
            options = options || this.options || {};
            let radius = options.radius || 0;
            radius = Math.max(radius, radius && options.hoverRadius || 0);
            const borderWidth = radius && options.borderWidth || 0;
            return (radius + borderWidth) * 2;
        }
        draw(ctx, area) {
            const options = this.options;
            if (this.skip || options.radius < 0.1 || !_isPointInArea(this, area, this.size(options) / 2)) {
                return;
            }
            ctx.strokeStyle = options.borderColor;
            ctx.lineWidth = options.borderWidth;
            ctx.fillStyle = options.backgroundColor;
            drawPoint(ctx, options, this.x, this.y);
        }
        getRange() {
            const options = this.options || {};
            return options.radius + options.hitRadius;
        }
    }
    PointElement.id = 'point';
    PointElement.defaults = {
        borderWidth: 1,
        hitRadius: 1,
        hoverBorderWidth: 1,
        hoverRadius: 4,
        pointStyle: 'circle',
        radius: 3,
        rotation: 0
    };
    PointElement.defaultRoutes = {
        backgroundColor: 'backgroundColor',
        borderColor: 'borderColor'
    };

    function getBarBounds(bar, useFinalPosition) {
        const {x, y, base, width, height} = bar.getProps(['x', 'y', 'base', 'width', 'height'], useFinalPosition);
        let left, right, top, bottom, half;
        if (bar.horizontal) {
            half = height / 2;
            left = Math.min(x, base);
            right = Math.max(x, base);
            top = y - half;
            bottom = y + half;
        } else {
            half = width / 2;
            left = x - half;
            right = x + half;
            top = Math.min(y, base);
            bottom = Math.max(y, base);
        }
        return {left, top, right, bottom};
    }
    function skipOrLimit(skip, value, min, max) {
        return skip ? 0 : _limitValue(value, min, max);
    }
    function parseBorderWidth(bar, maxW, maxH) {
        const value = bar.options.borderWidth;
        const skip = bar.borderSkipped;
        const o = toTRBL(value);
        return {
            t: skipOrLimit(skip.top, o.top, 0, maxH),
            r: skipOrLimit(skip.right, o.right, 0, maxW),
            b: skipOrLimit(skip.bottom, o.bottom, 0, maxH),
            l: skipOrLimit(skip.left, o.left, 0, maxW)
        };
    }
    function parseBorderRadius(bar, maxW, maxH) {
        const {enableBorderRadius} = bar.getProps(['enableBorderRadius']);
        const value = bar.options.borderRadius;
        const o = toTRBLCorners(value);
        const maxR = Math.min(maxW, maxH);
        const skip = bar.borderSkipped;
        const enableBorder = enableBorderRadius || isObject(value);
        return {
            topLeft: skipOrLimit(!enableBorder || skip.top || skip.left, o.topLeft, 0, maxR),
            topRight: skipOrLimit(!enableBorder || skip.top || skip.right, o.topRight, 0, maxR),
            bottomLeft: skipOrLimit(!enableBorder || skip.bottom || skip.left, o.bottomLeft, 0, maxR),
            bottomRight: skipOrLimit(!enableBorder || skip.bottom || skip.right, o.bottomRight, 0, maxR)
        };
    }
    function boundingRects(bar) {
        const bounds = getBarBounds(bar);
        const width = bounds.right - bounds.left;
        const height = bounds.bottom - bounds.top;
        const border = parseBorderWidth(bar, width / 2, height / 2);
        const radius = parseBorderRadius(bar, width / 2, height / 2);
        return {
            outer: {
                x: bounds.left,
                y: bounds.top,
                w: width,
                h: height,
                radius
            },
            inner: {
                x: bounds.left + border.l,
                y: bounds.top + border.t,
                w: width - border.l - border.r,
                h: height - border.t - border.b,
                radius: {
                    topLeft: Math.max(0, radius.topLeft - Math.max(border.t, border.l)),
                    topRight: Math.max(0, radius.topRight - Math.max(border.t, border.r)),
                    bottomLeft: Math.max(0, radius.bottomLeft - Math.max(border.b, border.l)),
                    bottomRight: Math.max(0, radius.bottomRight - Math.max(border.b, border.r)),
                }
            }
        };
    }
    function inRange(bar, x, y, useFinalPosition) {
        const skipX = x === null;
        const skipY = y === null;
        const skipBoth = skipX && skipY;
        const bounds = bar && !skipBoth && getBarBounds(bar, useFinalPosition);
        return bounds
            && (skipX || _isBetween(x, bounds.left, bounds.right))
            && (skipY || _isBetween(y, bounds.top, bounds.bottom));
    }
    function hasRadius(radius) {
        return radius.topLeft || radius.topRight || radius.bottomLeft || radius.bottomRight;
    }
    function addNormalRectPath(ctx, rect) {
        ctx.rect(rect.x, rect.y, rect.w, rect.h);
    }
    function inflateRect(rect, amount, refRect = {}) {
        const x = rect.x !== refRect.x ? -amount : 0;
        const y = rect.y !== refRect.y ? -amount : 0;
        const w = (rect.x + rect.w !== refRect.x + refRect.w ? amount : 0) - x;
        const h = (rect.y + rect.h !== refRect.y + refRect.h ? amount : 0) - y;
        return {
            x: rect.x + x,
            y: rect.y + y,
            w: rect.w + w,
            h: rect.h + h,
            radius: rect.radius
        };
    }
    class BarElement extends Element {
        constructor(cfg) {
            super();
            this.options = undefined;
            this.horizontal = undefined;
            this.base = undefined;
            this.width = undefined;
            this.height = undefined;
            this.inflateAmount = undefined;
            if (cfg) {
                Object.assign(this, cfg);
            }
        }
        draw(ctx) {
            const {inflateAmount, options: {borderColor, backgroundColor}} = this;
            const {inner, outer} = boundingRects(this);
            const addRectPath = hasRadius(outer.radius) ? addRoundedRectPath : addNormalRectPath;
            ctx.save();
            if (outer.w !== inner.w || outer.h !== inner.h) {
                ctx.beginPath();
                addRectPath(ctx, inflateRect(outer, inflateAmount, inner));
                ctx.clip();
                addRectPath(ctx, inflateRect(inner, -inflateAmount, outer));
                ctx.fillStyle = borderColor;
                ctx.fill('evenodd');
            }
            ctx.beginPath();
            addRectPath(ctx, inflateRect(inner, inflateAmount));
            ctx.fillStyle = backgroundColor;
            ctx.fill();
            ctx.restore();
        }
        inRange(mouseX, mouseY, useFinalPosition) {
            return inRange(this, mouseX, mouseY, useFinalPosition);
        }
        inXRange(mouseX, useFinalPosition) {
            return inRange(this, mouseX, null, useFinalPosition);
        }
        inYRange(mouseY, useFinalPosition) {
            return inRange(this, null, mouseY, useFinalPosition);
        }
        getCenterPoint(useFinalPosition) {
            const {x, y, base, horizontal} = this.getProps(['x', 'y', 'base', 'horizontal'], useFinalPosition);
            return {
                x: horizontal ? (x + base) / 2 : x,
                y: horizontal ? y : (y + base) / 2
            };
        }
        getRange(axis) {
            return axis === 'x' ? this.width / 2 : this.height / 2;
        }
    }
    BarElement.id = 'bar';
    BarElement.defaults = {
        borderSkipped: 'start',
        borderWidth: 0,
        borderRadius: 0,
        inflateAmount: 'auto',
        pointStyle: undefined
    };
    BarElement.defaultRoutes = {
        backgroundColor: 'backgroundColor',
        borderColor: 'borderColor'
    };

    var elements = /*#__PURE__*/Object.freeze({
        __proto__: null,
        ArcElement: ArcElement,
        LineElement: LineElement,
        PointElement: PointElement,
        BarElement: BarElement
    });

    function lttbDecimation(data, start, count, availableWidth, options) {
        const samples = options.samples || availableWidth;
        if (samples >= count) {
            return data.slice(start, start + count);
        }
        const decimated = [];
        const bucketWidth = (count - 2) / (samples - 2);
        let sampledIndex = 0;
        const endIndex = start + count - 1;
        let a = start;
        let i, maxAreaPoint, maxArea, area, nextA;
        decimated[sampledIndex++] = data[a];
        for (i = 0; i < samples - 2; i++) {
            let avgX = 0;
            let avgY = 0;
            let j;
            const avgRangeStart = Math.floor((i + 1) * bucketWidth) + 1 + start;
            const avgRangeEnd = Math.min(Math.floor((i + 2) * bucketWidth) + 1, count) + start;
            const avgRangeLength = avgRangeEnd - avgRangeStart;
            for (j = avgRangeStart; j < avgRangeEnd; j++) {
                avgX += data[j].x;
                avgY += data[j].y;
            }
            avgX /= avgRangeLength;
            avgY /= avgRangeLength;
            const rangeOffs = Math.floor(i * bucketWidth) + 1 + start;
            const rangeTo = Math.min(Math.floor((i + 1) * bucketWidth) + 1, count) + start;
            const {x: pointAx, y: pointAy} = data[a];
            maxArea = area = -1;
            for (j = rangeOffs; j < rangeTo; j++) {
                area = 0.5 * Math.abs(
                    (pointAx - avgX) * (data[j].y - pointAy) -
                    (pointAx - data[j].x) * (avgY - pointAy)
                );
                if (area > maxArea) {
                    maxArea = area;
                    maxAreaPoint = data[j];
                    nextA = j;
                }
            }
            decimated[sampledIndex++] = maxAreaPoint;
            a = nextA;
        }
        decimated[sampledIndex++] = data[endIndex];
        return decimated;
    }
    function minMaxDecimation(data, start, count, availableWidth) {
        let avgX = 0;
        let countX = 0;
        let i, point, x, y, prevX, minIndex, maxIndex, startIndex, minY, maxY;
        const decimated = [];
        const endIndex = start + count - 1;
        const xMin = data[start].x;
        const xMax = data[endIndex].x;
        const dx = xMax - xMin;
        for (i = start; i < start + count; ++i) {
            point = data[i];
            x = (point.x - xMin) / dx * availableWidth;
            y = point.y;
            const truncX = x | 0;
            if (truncX === prevX) {
                if (y < minY) {
                    minY = y;
                    minIndex = i;
                } else if (y > maxY) {
                    maxY = y;
                    maxIndex = i;
                }
                avgX = (countX * avgX + point.x) / ++countX;
            } else {
                const lastIndex = i - 1;
                if (!isNullOrUndef(minIndex) && !isNullOrUndef(maxIndex)) {
                    const intermediateIndex1 = Math.min(minIndex, maxIndex);
                    const intermediateIndex2 = Math.max(minIndex, maxIndex);
                    if (intermediateIndex1 !== startIndex && intermediateIndex1 !== lastIndex) {
                        decimated.push({
                            ...data[intermediateIndex1],
                            x: avgX,
                        });
                    }
                    if (intermediateIndex2 !== startIndex && intermediateIndex2 !== lastIndex) {
                        decimated.push({
                            ...data[intermediateIndex2],
                            x: avgX
                        });
                    }
                }
                if (i > 0 && lastIndex !== startIndex) {
                    decimated.push(data[lastIndex]);
                }
                decimated.push(point);
                prevX = truncX;
                countX = 0;
                minY = maxY = y;
                minIndex = maxIndex = startIndex = i;
            }
        }
        return decimated;
    }
    function cleanDecimatedDataset(dataset) {
        if (dataset._decimated) {
            const data = dataset._data;
            delete dataset._decimated;
            delete dataset._data;
            Object.defineProperty(dataset, 'data', {value: data});
        }
    }
    function cleanDecimatedData(chart) {
        chart.data.datasets.forEach((dataset) => {
            cleanDecimatedDataset(dataset);
        });
    }
    function getStartAndCountOfVisiblePointsSimplified(meta, points) {
        const pointCount = points.length;
        let start = 0;
        let count;
        const {iScale} = meta;
        const {min, max, minDefined, maxDefined} = iScale.getUserBounds();
        if (minDefined) {
            start = _limitValue(_lookupByKey(points, iScale.axis, min).lo, 0, pointCount - 1);
        }
        if (maxDefined) {
            count = _limitValue(_lookupByKey(points, iScale.axis, max).hi + 1, start, pointCount) - start;
        } else {
            count = pointCount - start;
        }
        return {start, count};
    }
    var plugin_decimation = {
        id: 'decimation',
        defaults: {
            algorithm: 'min-max',
            enabled: false,
        },
        beforeElementsUpdate: (chart, args, options) => {
            if (!options.enabled) {
                cleanDecimatedData(chart);
                return;
            }
            const availableWidth = chart.width;
            chart.data.datasets.forEach((dataset, datasetIndex) => {
                const {_data, indexAxis} = dataset;
                const meta = chart.getDatasetMeta(datasetIndex);
                const data = _data || dataset.data;
                if (resolve([indexAxis, chart.options.indexAxis]) === 'y') {
                    return;
                }
                if (!meta.controller.supportsDecimation) {
                    return;
                }
                const xAxis = chart.scales[meta.xAxisID];
                if (xAxis.type !== 'linear' && xAxis.type !== 'time') {
                    return;
                }
                if (chart.options.parsing) {
                    return;
                }
                let {start, count} = getStartAndCountOfVisiblePointsSimplified(meta, data);
                const threshold = options.threshold || 4 * availableWidth;
                if (count <= threshold) {
                    cleanDecimatedDataset(dataset);
                    return;
                }
                if (isNullOrUndef(_data)) {
                    dataset._data = data;
                    delete dataset.data;
                    Object.defineProperty(dataset, 'data', {
                        configurable: true,
                        enumerable: true,
                        get: function() {
                            return this._decimated;
                        },
                        set: function(d) {
                            this._data = d;
                        }
                    });
                }
                let decimated;
                switch (options.algorithm) {
                    case 'lttb':
                        decimated = lttbDecimation(data, start, count, availableWidth, options);
                        break;
                    case 'min-max':
                        decimated = minMaxDecimation(data, start, count, availableWidth);
                        break;
                    default:
                        throw new Error(`Unsupported decimation algorithm '${options.algorithm}'`);
                }
                dataset._decimated = decimated;
            });
        },
        destroy(chart) {
            cleanDecimatedData(chart);
        }
    };

    function _segments(line, target, property) {
        const segments = line.segments;
        const points = line.points;
        const tpoints = target.points;
        const parts = [];
        for (const segment of segments) {
            let {start, end} = segment;
            end = _findSegmentEnd(start, end, points);
            const bounds = _getBounds(property, points[start], points[end], segment.loop);
            if (!target.segments) {
                parts.push({
                    source: segment,
                    target: bounds,
                    start: points[start],
                    end: points[end]
                });
                continue;
            }
            const targetSegments = _boundSegments(target, bounds);
            for (const tgt of targetSegments) {
                const subBounds = _getBounds(property, tpoints[tgt.start], tpoints[tgt.end], tgt.loop);
                const fillSources = _boundSegment(segment, points, subBounds);
                for (const fillSource of fillSources) {
                    parts.push({
                        source: fillSource,
                        target: tgt,
                        start: {
                            [property]: _getEdge(bounds, subBounds, 'start', Math.max)
                        },
                        end: {
                            [property]: _getEdge(bounds, subBounds, 'end', Math.min)
                        }
                    });
                }
            }
        }
        return parts;
    }
    function _getBounds(property, first, last, loop) {
        if (loop) {
            return;
        }
        let start = first[property];
        let end = last[property];
        if (property === 'angle') {
            start = _normalizeAngle(start);
            end = _normalizeAngle(end);
        }
        return {property, start, end};
    }
    function _pointsFromSegments(boundary, line) {
        const {x = null, y = null} = boundary || {};
        const linePoints = line.points;
        const points = [];
        line.segments.forEach(({start, end}) => {
            end = _findSegmentEnd(start, end, linePoints);
            const first = linePoints[start];
            const last = linePoints[end];
            if (y !== null) {
                points.push({x: first.x, y});
                points.push({x: last.x, y});
            } else if (x !== null) {
                points.push({x, y: first.y});
                points.push({x, y: last.y});
            }
        });
        return points;
    }
    function _findSegmentEnd(start, end, points) {
        for (;end > start; end--) {
            const point = points[end];
            if (!isNaN(point.x) && !isNaN(point.y)) {
                break;
            }
        }
        return end;
    }
    function _getEdge(a, b, prop, fn) {
        if (a && b) {
            return fn(a[prop], b[prop]);
        }
        return a ? a[prop] : b ? b[prop] : 0;
    }

    function _createBoundaryLine(boundary, line) {
        let points = [];
        let _loop = false;
        if (isArray(boundary)) {
            _loop = true;
            points = boundary;
        } else {
            points = _pointsFromSegments(boundary, line);
        }
        return points.length ? new LineElement({
            points,
            options: {tension: 0},
            _loop,
            _fullLoop: _loop
        }) : null;
    }
    function _shouldApplyFill(source) {
        return source && source.fill !== false;
    }

    function _resolveTarget(sources, index, propagate) {
        const source = sources[index];
        let fill = source.fill;
        const visited = [index];
        let target;
        if (!propagate) {
            return fill;
        }
        while (fill !== false && visited.indexOf(fill) === -1) {
            if (!isNumberFinite(fill)) {
                return fill;
            }
            target = sources[fill];
            if (!target) {
                return false;
            }
            if (target.visible) {
                return fill;
            }
            visited.push(fill);
            fill = target.fill;
        }
        return false;
    }
    function _decodeFill(line, index, count) {
        const fill = parseFillOption(line);
        if (isObject(fill)) {
            return isNaN(fill.value) ? false : fill;
        }
        let target = parseFloat(fill);
        if (isNumberFinite(target) && Math.floor(target) === target) {
            return decodeTargetIndex(fill[0], index, target, count);
        }
        return ['origin', 'start', 'end', 'stack', 'shape'].indexOf(fill) >= 0 && fill;
    }
    function decodeTargetIndex(firstCh, index, target, count) {
        if (firstCh === '-' || firstCh === '+') {
            target = index + target;
        }
        if (target === index || target < 0 || target >= count) {
            return false;
        }
        return target;
    }
    function _getTargetPixel(fill, scale) {
        let pixel = null;
        if (fill === 'start') {
            pixel = scale.bottom;
        } else if (fill === 'end') {
            pixel = scale.top;
        } else if (isObject(fill)) {
            pixel = scale.getPixelForValue(fill.value);
        } else if (scale.getBasePixel) {
            pixel = scale.getBasePixel();
        }
        return pixel;
    }
    function _getTargetValue(fill, scale, startValue) {
        let value;
        if (fill === 'start') {
            value = startValue;
        } else if (fill === 'end') {
            value = scale.options.reverse ? scale.min : scale.max;
        } else if (isObject(fill)) {
            value = fill.value;
        } else {
            value = scale.getBaseValue();
        }
        return value;
    }
    function parseFillOption(line) {
        const options = line.options;
        const fillOption = options.fill;
        let fill = valueOrDefault(fillOption && fillOption.target, fillOption);
        if (fill === undefined) {
            fill = !!options.backgroundColor;
        }
        if (fill === false || fill === null) {
            return false;
        }
        if (fill === true) {
            return 'origin';
        }
        return fill;
    }

    function _buildStackLine(source) {
        const {scale, index, line} = source;
        const points = [];
        const segments = line.segments;
        const sourcePoints = line.points;
        const linesBelow = getLinesBelow(scale, index);
        linesBelow.push(_createBoundaryLine({x: null, y: scale.bottom}, line));
        for (let i = 0; i < segments.length; i++) {
            const segment = segments[i];
            for (let j = segment.start; j <= segment.end; j++) {
                addPointsBelow(points, sourcePoints[j], linesBelow);
            }
        }
        return new LineElement({points, options: {}});
    }
    function getLinesBelow(scale, index) {
        const below = [];
        const metas = scale.getMatchingVisibleMetas('line');
        for (let i = 0; i < metas.length; i++) {
            const meta = metas[i];
            if (meta.index === index) {
                break;
            }
            if (!meta.hidden) {
                below.unshift(meta.dataset);
            }
        }
        return below;
    }
    function addPointsBelow(points, sourcePoint, linesBelow) {
        const postponed = [];
        for (let j = 0; j < linesBelow.length; j++) {
            const line = linesBelow[j];
            const {first, last, point} = findPoint(line, sourcePoint, 'x');
            if (!point || (first && last)) {
                continue;
            }
            if (first) {
                postponed.unshift(point);
            } else {
                points.push(point);
                if (!last) {
                    break;
                }
            }
        }
        points.push(...postponed);
    }
    function findPoint(line, sourcePoint, property) {
        const point = line.interpolate(sourcePoint, property);
        if (!point) {
            return {};
        }
        const pointValue = point[property];
        const segments = line.segments;
        const linePoints = line.points;
        let first = false;
        let last = false;
        for (let i = 0; i < segments.length; i++) {
            const segment = segments[i];
            const firstValue = linePoints[segment.start][property];
            const lastValue = linePoints[segment.end][property];
            if (_isBetween(pointValue, firstValue, lastValue)) {
                first = pointValue === firstValue;
                last = pointValue === lastValue;
                break;
            }
        }
        return {first, last, point};
    }

    class simpleArc {
        constructor(opts) {
            this.x = opts.x;
            this.y = opts.y;
            this.radius = opts.radius;
        }
        pathSegment(ctx, bounds, opts) {
            const {x, y, radius} = this;
            bounds = bounds || {start: 0, end: TAU};
            ctx.arc(x, y, radius, bounds.end, bounds.start, true);
            return !opts.bounds;
        }
        interpolate(point) {
            const {x, y, radius} = this;
            const angle = point.angle;
            return {
                x: x + Math.cos(angle) * radius,
                y: y + Math.sin(angle) * radius,
                angle
            };
        }
    }

    function _getTarget(source) {
        const {chart, fill, line} = source;
        if (isNumberFinite(fill)) {
            return getLineByIndex(chart, fill);
        }
        if (fill === 'stack') {
            return _buildStackLine(source);
        }
        if (fill === 'shape') {
            return true;
        }
        const boundary = computeBoundary(source);
        if (boundary instanceof simpleArc) {
            return boundary;
        }
        return _createBoundaryLine(boundary, line);
    }
    function getLineByIndex(chart, index) {
        const meta = chart.getDatasetMeta(index);
        const visible = meta && chart.isDatasetVisible(index);
        return visible ? meta.dataset : null;
    }
    function computeBoundary(source) {
        const scale = source.scale || {};
        if (scale.getPointPositionForValue) {
            return computeCircularBoundary(source);
        }
        return computeLinearBoundary(source);
    }
    function computeLinearBoundary(source) {
        const {scale = {}, fill} = source;
        const pixel = _getTargetPixel(fill, scale);
        if (isNumberFinite(pixel)) {
            const horizontal = scale.isHorizontal();
            return {
                x: horizontal ? pixel : null,
                y: horizontal ? null : pixel
            };
        }
        return null;
    }
    function computeCircularBoundary(source) {
        const {scale, fill} = source;
        const options = scale.options;
        const length = scale.getLabels().length;
        const start = options.reverse ? scale.max : scale.min;
        const value = _getTargetValue(fill, scale, start);
        const target = [];
        if (options.grid.circular) {
            const center = scale.getPointPositionForValue(0, start);
            return new simpleArc({
                x: center.x,
                y: center.y,
                radius: scale.getDistanceFromCenterForValue(value)
            });
        }
        for (let i = 0; i < length; ++i) {
            target.push(scale.getPointPositionForValue(i, value));
        }
        return target;
    }

    function _drawfill(ctx, source, area) {
        const target = _getTarget(source);
        const {line, scale, axis} = source;
        const lineOpts = line.options;
        const fillOption = lineOpts.fill;
        const color = lineOpts.backgroundColor;
        const {above = color, below = color} = fillOption || {};
        if (target && line.points.length) {
            clipArea(ctx, area);
            doFill(ctx, {line, target, above, below, area, scale, axis});
            unclipArea(ctx);
        }
    }
    function doFill(ctx, cfg) {
        const {line, target, above, below, area, scale} = cfg;
        const property = line._loop ? 'angle' : cfg.axis;
        ctx.save();
        if (property === 'x' && below !== above) {
            clipVertical(ctx, target, area.top);
            fill(ctx, {line, target, color: above, scale, property});
            ctx.restore();
            ctx.save();
            clipVertical(ctx, target, area.bottom);
        }
        fill(ctx, {line, target, color: below, scale, property});
        ctx.restore();
    }
    function clipVertical(ctx, target, clipY) {
        const {segments, points} = target;
        let first = true;
        let lineLoop = false;
        ctx.beginPath();
        for (const segment of segments) {
            const {start, end} = segment;
            const firstPoint = points[start];
            const lastPoint = points[_findSegmentEnd(start, end, points)];
            if (first) {
                ctx.moveTo(firstPoint.x, firstPoint.y);
                first = false;
            } else {
                ctx.lineTo(firstPoint.x, clipY);
                ctx.lineTo(firstPoint.x, firstPoint.y);
            }
            lineLoop = !!target.pathSegment(ctx, segment, {move: lineLoop});
            if (lineLoop) {
                ctx.closePath();
            } else {
                ctx.lineTo(lastPoint.x, clipY);
            }
        }
        ctx.lineTo(target.first().x, clipY);
        ctx.closePath();
        ctx.clip();
    }
    function fill(ctx, cfg) {
        const {line, target, property, color, scale} = cfg;
        const segments = _segments(line, target, property);
        for (const {source: src, target: tgt, start, end} of segments) {
            const {style: {backgroundColor = color} = {}} = src;
            const notShape = target !== true;
            ctx.save();
            ctx.fillStyle = backgroundColor;
            clipBounds(ctx, scale, notShape && _getBounds(property, start, end));
            ctx.beginPath();
            const lineLoop = !!line.pathSegment(ctx, src);
            let loop;
            if (notShape) {
                if (lineLoop) {
                    ctx.closePath();
                } else {
                    interpolatedLineTo(ctx, target, end, property);
                }
                const targetLoop = !!target.pathSegment(ctx, tgt, {move: lineLoop, reverse: true});
                loop = lineLoop && targetLoop;
                if (!loop) {
                    interpolatedLineTo(ctx, target, start, property);
                }
            }
            ctx.closePath();
            ctx.fill(loop ? 'evenodd' : 'nonzero');
            ctx.restore();
        }
    }
    function clipBounds(ctx, scale, bounds) {
        const {top, bottom} = scale.chart.chartArea;
        const {property, start, end} = bounds || {};
        if (property === 'x') {
            ctx.beginPath();
            ctx.rect(start, top, end - start, bottom - top);
            ctx.clip();
        }
    }
    function interpolatedLineTo(ctx, target, point, property) {
        const interpolatedPoint = target.interpolate(point, property);
        if (interpolatedPoint) {
            ctx.lineTo(interpolatedPoint.x, interpolatedPoint.y);
        }
    }

    var index = {
        id: 'filler',
        afterDatasetsUpdate(chart, _args, options) {
            const count = (chart.data.datasets || []).length;
            const sources = [];
            let meta, i, line, source;
            for (i = 0; i < count; ++i) {
                meta = chart.getDatasetMeta(i);
                line = meta.dataset;
                source = null;
                if (line && line.options && line instanceof LineElement) {
                    source = {
                        visible: chart.isDatasetVisible(i),
                        index: i,
                        fill: _decodeFill(line, i, count),
                        chart,
                        axis: meta.controller.options.indexAxis,
                        scale: meta.vScale,
                        line,
                    };
                }
                meta.$filler = source;
                sources.push(source);
            }
            for (i = 0; i < count; ++i) {
                source = sources[i];
                if (!source || source.fill === false) {
                    continue;
                }
                source.fill = _resolveTarget(sources, i, options.propagate);
            }
        },
        beforeDraw(chart, _args, options) {
            const draw = options.drawTime === 'beforeDraw';
            const metasets = chart.getSortedVisibleDatasetMetas();
            const area = chart.chartArea;
            for (let i = metasets.length - 1; i >= 0; --i) {
                const source = metasets[i].$filler;
                if (!source) {
                    continue;
                }
                source.line.updateControlPoints(area, source.axis);
                if (draw && source.fill) {
                    _drawfill(chart.ctx, source, area);
                }
            }
        },
        beforeDatasetsDraw(chart, _args, options) {
            if (options.drawTime !== 'beforeDatasetsDraw') {
                return;
            }
            const metasets = chart.getSortedVisibleDatasetMetas();
            for (let i = metasets.length - 1; i >= 0; --i) {
                const source = metasets[i].$filler;
                if (_shouldApplyFill(source)) {
                    _drawfill(chart.ctx, source, chart.chartArea);
                }
            }
        },
        beforeDatasetDraw(chart, args, options) {
            const source = args.meta.$filler;
            if (!_shouldApplyFill(source) || options.drawTime !== 'beforeDatasetDraw') {
                return;
            }
            _drawfill(chart.ctx, source, chart.chartArea);
        },
        defaults: {
            propagate: true,
            drawTime: 'beforeDatasetDraw'
        }
    };

    const getBoxSize = (labelOpts, fontSize) => {
        let {boxHeight = fontSize, boxWidth = fontSize} = labelOpts;
        if (labelOpts.usePointStyle) {
            boxHeight = Math.min(boxHeight, fontSize);
            boxWidth = labelOpts.pointStyleWidth || Math.min(boxWidth, fontSize);
        }
        return {
            boxWidth,
            boxHeight,
            itemHeight: Math.max(fontSize, boxHeight)
        };
    };
    const itemsEqual = (a, b) => a !== null && b !== null && a.datasetIndex === b.datasetIndex && a.index === b.index;
    class Legend extends Element {
        constructor(config) {
            super();
            this._added = false;
            this.legendHitBoxes = [];
            this._hoveredItem = null;
            this.doughnutMode = false;
            this.chart = config.chart;
            this.options = config.options;
            this.ctx = config.ctx;
            this.legendItems = undefined;
            this.columnSizes = undefined;
            this.lineWidths = undefined;
            this.maxHeight = undefined;
            this.maxWidth = undefined;
            this.top = undefined;
            this.bottom = undefined;
            this.left = undefined;
            this.right = undefined;
            this.height = undefined;
            this.width = undefined;
            this._margins = undefined;
            this.position = undefined;
            this.weight = undefined;
            this.fullSize = undefined;
        }
        update(maxWidth, maxHeight, margins) {
            this.maxWidth = maxWidth;
            this.maxHeight = maxHeight;
            this._margins = margins;
            this.setDimensions();
            this.buildLabels();
            this.fit();
        }
        setDimensions() {
            if (this.isHorizontal()) {
                this.width = this.maxWidth;
                this.left = this._margins.left;
                this.right = this.width;
            } else {
                this.height = this.maxHeight;
                this.top = this._margins.top;
                this.bottom = this.height;
            }
        }
        buildLabels() {
            const labelOpts = this.options.labels || {};
            let legendItems = callback(labelOpts.generateLabels, [this.chart], this) || [];
            if (labelOpts.filter) {
                legendItems = legendItems.filter((item) => labelOpts.filter(item, this.chart.data));
            }
            if (labelOpts.sort) {
                legendItems = legendItems.sort((a, b) => labelOpts.sort(a, b, this.chart.data));
            }
            if (this.options.reverse) {
                legendItems.reverse();
            }
            this.legendItems = legendItems;
        }
        fit() {
            const {options, ctx} = this;
            if (!options.display) {
                this.width = this.height = 0;
                return;
            }
            const labelOpts = options.labels;
            const labelFont = toFont(labelOpts.font);
            const fontSize = labelFont.size;
            const titleHeight = this._computeTitleHeight();
            const {boxWidth, itemHeight} = getBoxSize(labelOpts, fontSize);
            let width, height;
            ctx.font = labelFont.string;
            if (this.isHorizontal()) {
                width = this.maxWidth;
                height = this._fitRows(titleHeight, fontSize, boxWidth, itemHeight) + 10;
            } else {
                height = this.maxHeight;
                width = this._fitCols(titleHeight, fontSize, boxWidth, itemHeight) + 10;
            }
            this.width = Math.min(width, options.maxWidth || this.maxWidth);
            this.height = Math.min(height, options.maxHeight || this.maxHeight);
        }
        _fitRows(titleHeight, fontSize, boxWidth, itemHeight) {
            const {ctx, maxWidth, options: {labels: {padding}}} = this;
            const hitboxes = this.legendHitBoxes = [];
            const lineWidths = this.lineWidths = [0];
            const lineHeight = itemHeight + padding;
            let totalHeight = titleHeight;
            ctx.textAlign = 'left';
            ctx.textBaseline = 'middle';
            let row = -1;
            let top = -lineHeight;
            this.legendItems.forEach((legendItem, i) => {
                const itemWidth = boxWidth + (fontSize / 2) + ctx.measureText(legendItem.text).width;
                if (i === 0 || lineWidths[lineWidths.length - 1] + itemWidth + 2 * padding > maxWidth) {
                    totalHeight += lineHeight;
                    lineWidths[lineWidths.length - (i > 0 ? 0 : 1)] = 0;
                    top += lineHeight;
                    row++;
                }
                hitboxes[i] = {left: 0, top, row, width: itemWidth, height: itemHeight};
                lineWidths[lineWidths.length - 1] += itemWidth + padding;
            });
            return totalHeight;
        }
        _fitCols(titleHeight, fontSize, boxWidth, itemHeight) {
            const {ctx, maxHeight, options: {labels: {padding}}} = this;
            const hitboxes = this.legendHitBoxes = [];
            const columnSizes = this.columnSizes = [];
            const heightLimit = maxHeight - titleHeight;
            let totalWidth = padding;
            let currentColWidth = 0;
            let currentColHeight = 0;
            let left = 0;
            let col = 0;
            this.legendItems.forEach((legendItem, i) => {
                const itemWidth = boxWidth + (fontSize / 2) + ctx.measureText(legendItem.text).width;
                if (i > 0 && currentColHeight + itemHeight + 2 * padding > heightLimit) {
                    totalWidth += currentColWidth + padding;
                    columnSizes.push({width: currentColWidth, height: currentColHeight});
                    left += currentColWidth + padding;
                    col++;
                    currentColWidth = currentColHeight = 0;
                }
                hitboxes[i] = {left, top: currentColHeight, col, width: itemWidth, height: itemHeight};
                currentColWidth = Math.max(currentColWidth, itemWidth);
                currentColHeight += itemHeight + padding;
            });
            totalWidth += currentColWidth;
            columnSizes.push({width: currentColWidth, height: currentColHeight});
            return totalWidth;
        }
        adjustHitBoxes() {
            if (!this.options.display) {
                return;
            }
            const titleHeight = this._computeTitleHeight();
            const {legendHitBoxes: hitboxes, options: {align, labels: {padding}, rtl}} = this;
            const rtlHelper = getRtlAdapter(rtl, this.left, this.width);
            if (this.isHorizontal()) {
                let row = 0;
                let left = _alignStartEnd(align, this.left + padding, this.right - this.lineWidths[row]);
                for (const hitbox of hitboxes) {
                    if (row !== hitbox.row) {
                        row = hitbox.row;
                        left = _alignStartEnd(align, this.left + padding, this.right - this.lineWidths[row]);
                    }
                    hitbox.top += this.top + titleHeight + padding;
                    hitbox.left = rtlHelper.leftForLtr(rtlHelper.x(left), hitbox.width);
                    left += hitbox.width + padding;
                }
            } else {
                let col = 0;
                let top = _alignStartEnd(align, this.top + titleHeight + padding, this.bottom - this.columnSizes[col].height);
                for (const hitbox of hitboxes) {
                    if (hitbox.col !== col) {
                        col = hitbox.col;
                        top = _alignStartEnd(align, this.top + titleHeight + padding, this.bottom - this.columnSizes[col].height);
                    }
                    hitbox.top = top;
                    hitbox.left += this.left + padding;
                    hitbox.left = rtlHelper.leftForLtr(rtlHelper.x(hitbox.left), hitbox.width);
                    top += hitbox.height + padding;
                }
            }
        }
        isHorizontal() {
            return this.options.position === 'top' || this.options.position === 'bottom';
        }
        draw() {
            if (this.options.display) {
                const ctx = this.ctx;
                clipArea(ctx, this);
                this._draw();
                unclipArea(ctx);
            }
        }
        _draw() {
            const {options: opts, columnSizes, lineWidths, ctx} = this;
            const {align, labels: labelOpts} = opts;
            const defaultColor = defaults.color;
            const rtlHelper = getRtlAdapter(opts.rtl, this.left, this.width);
            const labelFont = toFont(labelOpts.font);
            const {color: fontColor, padding} = labelOpts;
            const fontSize = labelFont.size;
            const halfFontSize = fontSize / 2;
            let cursor;
            this.drawTitle();
            ctx.textAlign = rtlHelper.textAlign('left');
            ctx.textBaseline = 'middle';
            ctx.lineWidth = 0.5;
            ctx.font = labelFont.string;
            const {boxWidth, boxHeight, itemHeight} = getBoxSize(labelOpts, fontSize);
            const drawLegendBox = function(x, y, legendItem) {
                if (isNaN(boxWidth) || boxWidth <= 0 || isNaN(boxHeight) || boxHeight < 0) {
                    return;
                }
                ctx.save();
                const lineWidth = valueOrDefault(legendItem.lineWidth, 1);
                ctx.fillStyle = valueOrDefault(legendItem.fillStyle, defaultColor);
                ctx.lineCap = valueOrDefault(legendItem.lineCap, 'butt');
                ctx.lineDashOffset = valueOrDefault(legendItem.lineDashOffset, 0);
                ctx.lineJoin = valueOrDefault(legendItem.lineJoin, 'miter');
                ctx.lineWidth = lineWidth;
                ctx.strokeStyle = valueOrDefault(legendItem.strokeStyle, defaultColor);
                ctx.setLineDash(valueOrDefault(legendItem.lineDash, []));
                if (labelOpts.usePointStyle) {
                    const drawOptions = {
                        radius: boxHeight * Math.SQRT2 / 2,
                        pointStyle: legendItem.pointStyle,
                        rotation: legendItem.rotation,
                        borderWidth: lineWidth
                    };
                    const centerX = rtlHelper.xPlus(x, boxWidth / 2);
                    const centerY = y + halfFontSize;
                    drawPointLegend(ctx, drawOptions, centerX, centerY, labelOpts.pointStyleWidth && boxWidth);
                } else {
                    const yBoxTop = y + Math.max((fontSize - boxHeight) / 2, 0);
                    const xBoxLeft = rtlHelper.leftForLtr(x, boxWidth);
                    const borderRadius = toTRBLCorners(legendItem.borderRadius);
                    ctx.beginPath();
                    if (Object.values(borderRadius).some(v => v !== 0)) {
                        addRoundedRectPath(ctx, {
                            x: xBoxLeft,
                            y: yBoxTop,
                            w: boxWidth,
                            h: boxHeight,
                            radius: borderRadius,
                        });
                    } else {
                        ctx.rect(xBoxLeft, yBoxTop, boxWidth, boxHeight);
                    }
                    ctx.fill();
                    if (lineWidth !== 0) {
                        ctx.stroke();
                    }
                }
                ctx.restore();
            };
            const fillText = function(x, y, legendItem) {
                renderText(ctx, legendItem.text, x, y + (itemHeight / 2), labelFont, {
                    strikethrough: legendItem.hidden,
                    textAlign: rtlHelper.textAlign(legendItem.textAlign)
                });
            };
            const isHorizontal = this.isHorizontal();
            const titleHeight = this._computeTitleHeight();
            if (isHorizontal) {
                cursor = {
                    x: _alignStartEnd(align, this.left + padding, this.right - lineWidths[0]),
                    y: this.top + padding + titleHeight,
                    line: 0
                };
            } else {
                cursor = {
                    x: this.left + padding,
                    y: _alignStartEnd(align, this.top + titleHeight + padding, this.bottom - columnSizes[0].height),
                    line: 0
                };
            }
            overrideTextDirection(this.ctx, opts.textDirection);
            const lineHeight = itemHeight + padding;
            this.legendItems.forEach((legendItem, i) => {
                ctx.strokeStyle = legendItem.fontColor || fontColor;
                ctx.fillStyle = legendItem.fontColor || fontColor;
                const textWidth = ctx.measureText(legendItem.text).width;
                const textAlign = rtlHelper.textAlign(legendItem.textAlign || (legendItem.textAlign = labelOpts.textAlign));
                const width = boxWidth + halfFontSize + textWidth;
                let x = cursor.x;
                let y = cursor.y;
                rtlHelper.setWidth(this.width);
                if (isHorizontal) {
                    if (i > 0 && x + width + padding > this.right) {
                        y = cursor.y += lineHeight;
                        cursor.line++;
                        x = cursor.x = _alignStartEnd(align, this.left + padding, this.right - lineWidths[cursor.line]);
                    }
                } else if (i > 0 && y + lineHeight > this.bottom) {
                    x = cursor.x = x + columnSizes[cursor.line].width + padding;
                    cursor.line++;
                    y = cursor.y = _alignStartEnd(align, this.top + titleHeight + padding, this.bottom - columnSizes[cursor.line].height);
                }
                const realX = rtlHelper.x(x);
                drawLegendBox(realX, y, legendItem);
                x = _textX(textAlign, x + boxWidth + halfFontSize, isHorizontal ? x + width : this.right, opts.rtl);
                fillText(rtlHelper.x(x), y, legendItem);
                if (isHorizontal) {
                    cursor.x += width + padding;
                } else {
                    cursor.y += lineHeight;
                }
            });
            restoreTextDirection(this.ctx, opts.textDirection);
        }
        drawTitle() {
            const opts = this.options;
            const titleOpts = opts.title;
            const titleFont = toFont(titleOpts.font);
            const titlePadding = toPadding(titleOpts.padding);
            if (!titleOpts.display) {
                return;
            }
            const rtlHelper = getRtlAdapter(opts.rtl, this.left, this.width);
            const ctx = this.ctx;
            const position = titleOpts.position;
            const halfFontSize = titleFont.size / 2;
            const topPaddingPlusHalfFontSize = titlePadding.top + halfFontSize;
            let y;
            let left = this.left;
            let maxWidth = this.width;
            if (this.isHorizontal()) {
                maxWidth = Math.max(...this.lineWidths);
                y = this.top + topPaddingPlusHalfFontSize;
                left = _alignStartEnd(opts.align, left, this.right - maxWidth);
            } else {
                const maxHeight = this.columnSizes.reduce((acc, size) => Math.max(acc, size.height), 0);
                y = topPaddingPlusHalfFontSize + _alignStartEnd(opts.align, this.top, this.bottom - maxHeight - opts.labels.padding - this._computeTitleHeight());
            }
            const x = _alignStartEnd(position, left, left + maxWidth);
            ctx.textAlign = rtlHelper.textAlign(_toLeftRightCenter(position));
            ctx.textBaseline = 'middle';
            ctx.strokeStyle = titleOpts.color;
            ctx.fillStyle = titleOpts.color;
            ctx.font = titleFont.string;
            renderText(ctx, titleOpts.text, x, y, titleFont);
        }
        _computeTitleHeight() {
            const titleOpts = this.options.title;
            const titleFont = toFont(titleOpts.font);
            const titlePadding = toPadding(titleOpts.padding);
            return titleOpts.display ? titleFont.lineHeight + titlePadding.height : 0;
        }
        _getLegendItemAt(x, y) {
            let i, hitBox, lh;
            if (_isBetween(x, this.left, this.right)
                && _isBetween(y, this.top, this.bottom)) {
                lh = this.legendHitBoxes;
                for (i = 0; i < lh.length; ++i) {
                    hitBox = lh[i];
                    if (_isBetween(x, hitBox.left, hitBox.left + hitBox.width)
                        && _isBetween(y, hitBox.top, hitBox.top + hitBox.height)) {
                        return this.legendItems[i];
                    }
                }
            }
            return null;
        }
        handleEvent(e) {
            const opts = this.options;
            if (!isListened(e.type, opts)) {
                return;
            }
            const hoveredItem = this._getLegendItemAt(e.x, e.y);
            if (e.type === 'mousemove' || e.type === 'mouseout') {
                const previous = this._hoveredItem;
                const sameItem = itemsEqual(previous, hoveredItem);
                if (previous && !sameItem) {
                    callback(opts.onLeave, [e, previous, this], this);
                }
                this._hoveredItem = hoveredItem;
                if (hoveredItem && !sameItem) {
                    callback(opts.onHover, [e, hoveredItem, this], this);
                }
            } else if (hoveredItem) {
                callback(opts.onClick, [e, hoveredItem, this], this);
            }
        }
    }
    function isListened(type, opts) {
        if ((type === 'mousemove' || type === 'mouseout') && (opts.onHover || opts.onLeave)) {
            return true;
        }
        if (opts.onClick && (type === 'click' || type === 'mouseup')) {
            return true;
        }
        return false;
    }
    var plugin_legend = {
        id: 'legend',
        _element: Legend,
        start(chart, _args, options) {
            const legend = chart.legend = new Legend({ctx: chart.ctx, options, chart});
            layouts.configure(chart, legend, options);
            layouts.addBox(chart, legend);
        },
        stop(chart) {
            layouts.removeBox(chart, chart.legend);
            delete chart.legend;
        },
        beforeUpdate(chart, _args, options) {
            const legend = chart.legend;
            layouts.configure(chart, legend, options);
            legend.options = options;
        },
        afterUpdate(chart) {
            const legend = chart.legend;
            legend.buildLabels();
            legend.adjustHitBoxes();
        },
        afterEvent(chart, args) {
            if (!args.replay) {
                chart.legend.handleEvent(args.event);
            }
        },
        defaults: {
            display: true,
            position: 'top',
            align: 'center',
            fullSize: true,
            reverse: false,
            weight: 1000,
            onClick(e, legendItem, legend) {
                const index = legendItem.datasetIndex;
                const ci = legend.chart;
                if (ci.isDatasetVisible(index)) {
                    ci.hide(index);
                    legendItem.hidden = true;
                } else {
                    ci.show(index);
                    legendItem.hidden = false;
                }
            },
            onHover: null,
            onLeave: null,
            labels: {
                color: (ctx) => ctx.chart.options.color,
                boxWidth: 40,
                padding: 10,
                generateLabels(chart) {
                    const datasets = chart.data.datasets;
                    const {labels: {usePointStyle, pointStyle, textAlign, color}} = chart.legend.options;
                    return chart._getSortedDatasetMetas().map((meta) => {
                        const style = meta.controller.getStyle(usePointStyle ? 0 : undefined);
                        const borderWidth = toPadding(style.borderWidth);
                        return {
                            text: datasets[meta.index].label,
                            fillStyle: style.backgroundColor,
                            fontColor: color,
                            hidden: !meta.visible,
                            lineCap: style.borderCapStyle,
                            lineDash: style.borderDash,
                            lineDashOffset: style.borderDashOffset,
                            lineJoin: style.borderJoinStyle,
                            lineWidth: (borderWidth.width + borderWidth.height) / 4,
                            strokeStyle: style.borderColor,
                            pointStyle: pointStyle || style.pointStyle,
                            rotation: style.rotation,
                            textAlign: textAlign || style.textAlign,
                            borderRadius: 0,
                            datasetIndex: meta.index
                        };
                    }, this);
                }
            },
            title: {
                color: (ctx) => ctx.chart.options.color,
                display: false,
                position: 'center',
                text: '',
            }
        },
        descriptors: {
            _scriptable: (name) => !name.startsWith('on'),
            labels: {
                _scriptable: (name) => !['generateLabels', 'filter', 'sort'].includes(name),
            }
        },
    };

    class Title extends Element {
        constructor(config) {
            super();
            this.chart = config.chart;
            this.options = config.options;
            this.ctx = config.ctx;
            this._padding = undefined;
            this.top = undefined;
            this.bottom = undefined;
            this.left = undefined;
            this.right = undefined;
            this.width = undefined;
            this.height = undefined;
            this.position = undefined;
            this.weight = undefined;
            this.fullSize = undefined;
        }
        update(maxWidth, maxHeight) {
            const opts = this.options;
            this.left = 0;
            this.top = 0;
            if (!opts.display) {
                this.width = this.height = this.right = this.bottom = 0;
                return;
            }
            this.width = this.right = maxWidth;
            this.height = this.bottom = maxHeight;
            const lineCount = isArray(opts.text) ? opts.text.length : 1;
            this._padding = toPadding(opts.padding);
            const textSize = lineCount * toFont(opts.font).lineHeight + this._padding.height;
            if (this.isHorizontal()) {
                this.height = textSize;
            } else {
                this.width = textSize;
            }
        }
        isHorizontal() {
            const pos = this.options.position;
            return pos === 'top' || pos === 'bottom';
        }
        _drawArgs(offset) {
            const {top, left, bottom, right, options} = this;
            const align = options.align;
            let rotation = 0;
            let maxWidth, titleX, titleY;
            if (this.isHorizontal()) {
                titleX = _alignStartEnd(align, left, right);
                titleY = top + offset;
                maxWidth = right - left;
            } else {
                if (options.position === 'left') {
                    titleX = left + offset;
                    titleY = _alignStartEnd(align, bottom, top);
                    rotation = PI * -0.5;
                } else {
                    titleX = right - offset;
                    titleY = _alignStartEnd(align, top, bottom);
                    rotation = PI * 0.5;
                }
                maxWidth = bottom - top;
            }
            return {titleX, titleY, maxWidth, rotation};
        }
        draw() {
            const ctx = this.ctx;
            const opts = this.options;
            if (!opts.display) {
                return;
            }
            const fontOpts = toFont(opts.font);
            const lineHeight = fontOpts.lineHeight;
            const offset = lineHeight / 2 + this._padding.top;
            const {titleX, titleY, maxWidth, rotation} = this._drawArgs(offset);
            renderText(ctx, opts.text, 0, 0, fontOpts, {
                color: opts.color,
                maxWidth,
                rotation,
                textAlign: _toLeftRightCenter(opts.align),
                textBaseline: 'middle',
                translation: [titleX, titleY],
            });
        }
    }
    function createTitle(chart, titleOpts) {
        const title = new Title({
            ctx: chart.ctx,
            options: titleOpts,
            chart
        });
        layouts.configure(chart, title, titleOpts);
        layouts.addBox(chart, title);
        chart.titleBlock = title;
    }
    var plugin_title = {
        id: 'title',
        _element: Title,
        start(chart, _args, options) {
            createTitle(chart, options);
        },
        stop(chart) {
            const titleBlock = chart.titleBlock;
            layouts.removeBox(chart, titleBlock);
            delete chart.titleBlock;
        },
        beforeUpdate(chart, _args, options) {
            const title = chart.titleBlock;
            layouts.configure(chart, title, options);
            title.options = options;
        },
        defaults: {
            align: 'center',
            display: false,
            font: {
                weight: 'bold',
            },
            fullSize: true,
            padding: 10,
            position: 'top',
            text: '',
            weight: 2000
        },
        defaultRoutes: {
            color: 'color'
        },
        descriptors: {
            _scriptable: true,
            _indexable: false,
        },
    };

    const map = new WeakMap();
    var plugin_subtitle = {
        id: 'subtitle',
        start(chart, _args, options) {
            const title = new Title({
                ctx: chart.ctx,
                options,
                chart
            });
            layouts.configure(chart, title, options);
            layouts.addBox(chart, title);
            map.set(chart, title);
        },
        stop(chart) {
            layouts.removeBox(chart, map.get(chart));
            map.delete(chart);
        },
        beforeUpdate(chart, _args, options) {
            const title = map.get(chart);
            layouts.configure(chart, title, options);
            title.options = options;
        },
        defaults: {
            align: 'center',
            display: false,
            font: {
                weight: 'normal',
            },
            fullSize: true,
            padding: 0,
            position: 'top',
            text: '',
            weight: 1500
        },
        defaultRoutes: {
            color: 'color'
        },
        descriptors: {
            _scriptable: true,
            _indexable: false,
        },
    };

    const positioners = {
        average(items) {
            if (!items.length) {
                return false;
            }
            let i, len;
            let x = 0;
            let y = 0;
            let count = 0;
            for (i = 0, len = items.length; i < len; ++i) {
                const el = items[i].element;
                if (el && el.hasValue()) {
                    const pos = el.tooltipPosition();
                    x += pos.x;
                    y += pos.y;
                    ++count;
                }
            }
            return {
                x: x / count,
                y: y / count
            };
        },
        nearest(items, eventPosition) {
            if (!items.length) {
                return false;
            }
            let x = eventPosition.x;
            let y = eventPosition.y;
            let minDistance = Number.POSITIVE_INFINITY;
            let i, len, nearestElement;
            for (i = 0, len = items.length; i < len; ++i) {
                const el = items[i].element;
                if (el && el.hasValue()) {
                    const center = el.getCenterPoint();
                    const d = distanceBetweenPoints(eventPosition, center);
                    if (d < minDistance) {
                        minDistance = d;
                        nearestElement = el;
                    }
                }
            }
            if (nearestElement) {
                const tp = nearestElement.tooltipPosition();
                x = tp.x;
                y = tp.y;
            }
            return {
                x,
                y
            };
        }
    };
    function pushOrConcat(base, toPush) {
        if (toPush) {
            if (isArray(toPush)) {
                Array.prototype.push.apply(base, toPush);
            } else {
                base.push(toPush);
            }
        }
        return base;
    }
    function splitNewlines(str) {
        if ((typeof str === 'string' || str instanceof String) && str.indexOf('\n') > -1) {
            return str.split('\n');
        }
        return str;
    }
    function createTooltipItem(chart, item) {
        const {element, datasetIndex, index} = item;
        const controller = chart.getDatasetMeta(datasetIndex).controller;
        const {label, value} = controller.getLabelAndValue(index);
        return {
            chart,
            label,
            parsed: controller.getParsed(index),
            raw: chart.data.datasets[datasetIndex].data[index],
            formattedValue: value,
            dataset: controller.getDataset(),
            dataIndex: index,
            datasetIndex,
            element
        };
    }
    function getTooltipSize(tooltip, options) {
        const ctx = tooltip.chart.ctx;
        const {body, footer, title} = tooltip;
        const {boxWidth, boxHeight} = options;
        const bodyFont = toFont(options.bodyFont);
        const titleFont = toFont(options.titleFont);
        const footerFont = toFont(options.footerFont);
        const titleLineCount = title.length;
        const footerLineCount = footer.length;
        const bodyLineItemCount = body.length;
        const padding = toPadding(options.padding);
        let height = padding.height;
        let width = 0;
        let combinedBodyLength = body.reduce((count, bodyItem) => count + bodyItem.before.length + bodyItem.lines.length + bodyItem.after.length, 0);
        combinedBodyLength += tooltip.beforeBody.length + tooltip.afterBody.length;
        if (titleLineCount) {
            height += titleLineCount * titleFont.lineHeight
                + (titleLineCount - 1) * options.titleSpacing
                + options.titleMarginBottom;
        }
        if (combinedBodyLength) {
            const bodyLineHeight = options.displayColors ? Math.max(boxHeight, bodyFont.lineHeight) : bodyFont.lineHeight;
            height += bodyLineItemCount * bodyLineHeight
                + (combinedBodyLength - bodyLineItemCount) * bodyFont.lineHeight
                + (combinedBodyLength - 1) * options.bodySpacing;
        }
        if (footerLineCount) {
            height += options.footerMarginTop
                + footerLineCount * footerFont.lineHeight
                + (footerLineCount - 1) * options.footerSpacing;
        }
        let widthPadding = 0;
        const maxLineWidth = function(line) {
            width = Math.max(width, ctx.measureText(line).width + widthPadding);
        };
        ctx.save();
        ctx.font = titleFont.string;
        each(tooltip.title, maxLineWidth);
        ctx.font = bodyFont.string;
        each(tooltip.beforeBody.concat(tooltip.afterBody), maxLineWidth);
        widthPadding = options.displayColors ? (boxWidth + 2 + options.boxPadding) : 0;
        each(body, (bodyItem) => {
            each(bodyItem.before, maxLineWidth);
            each(bodyItem.lines, maxLineWidth);
            each(bodyItem.after, maxLineWidth);
        });
        widthPadding = 0;
        ctx.font = footerFont.string;
        each(tooltip.footer, maxLineWidth);
        ctx.restore();
        width += padding.width;
        return {width, height};
    }
    function determineYAlign(chart, size) {
        const {y, height} = size;
        if (y < height / 2) {
            return 'top';
        } else if (y > (chart.height - height / 2)) {
            return 'bottom';
        }
        return 'center';
    }
    function doesNotFitWithAlign(xAlign, chart, options, size) {
        const {x, width} = size;
        const caret = options.caretSize + options.caretPadding;
        if (xAlign === 'left' && x + width + caret > chart.width) {
            return true;
        }
        if (xAlign === 'right' && x - width - caret < 0) {
            return true;
        }
    }
    function determineXAlign(chart, options, size, yAlign) {
        const {x, width} = size;
        const {width: chartWidth, chartArea: {left, right}} = chart;
        let xAlign = 'center';
        if (yAlign === 'center') {
            xAlign = x <= (left + right) / 2 ? 'left' : 'right';
        } else if (x <= width / 2) {
            xAlign = 'left';
        } else if (x >= chartWidth - width / 2) {
            xAlign = 'right';
        }
        if (doesNotFitWithAlign(xAlign, chart, options, size)) {
            xAlign = 'center';
        }
        return xAlign;
    }
    function determineAlignment(chart, options, size) {
        const yAlign = size.yAlign || options.yAlign || determineYAlign(chart, size);
        return {
            xAlign: size.xAlign || options.xAlign || determineXAlign(chart, options, size, yAlign),
            yAlign
        };
    }
    function alignX(size, xAlign) {
        let {x, width} = size;
        if (xAlign === 'right') {
            x -= width;
        } else if (xAlign === 'center') {
            x -= (width / 2);
        }
        return x;
    }
    function alignY(size, yAlign, paddingAndSize) {
        let {y, height} = size;
        if (yAlign === 'top') {
            y += paddingAndSize;
        } else if (yAlign === 'bottom') {
            y -= height + paddingAndSize;
        } else {
            y -= (height / 2);
        }
        return y;
    }
    function getBackgroundPoint(options, size, alignment, chart) {
        const {caretSize, caretPadding, cornerRadius} = options;
        const {xAlign, yAlign} = alignment;
        const paddingAndSize = caretSize + caretPadding;
        const {topLeft, topRight, bottomLeft, bottomRight} = toTRBLCorners(cornerRadius);
        let x = alignX(size, xAlign);
        const y = alignY(size, yAlign, paddingAndSize);
        if (yAlign === 'center') {
            if (xAlign === 'left') {
                x += paddingAndSize;
            } else if (xAlign === 'right') {
                x -= paddingAndSize;
            }
        } else if (xAlign === 'left') {
            x -= Math.max(topLeft, bottomLeft) + caretSize;
        } else if (xAlign === 'right') {
            x += Math.max(topRight, bottomRight) + caretSize;
        }
        return {
            x: _limitValue(x, 0, chart.width - size.width),
            y: _limitValue(y, 0, chart.height - size.height)
        };
    }
    function getAlignedX(tooltip, align, options) {
        const padding = toPadding(options.padding);
        return align === 'center'
            ? tooltip.x + tooltip.width / 2
            : align === 'right'
                ? tooltip.x + tooltip.width - padding.right
                : tooltip.x + padding.left;
    }
    function getBeforeAfterBodyLines(callback) {
        return pushOrConcat([], splitNewlines(callback));
    }
    function createTooltipContext(parent, tooltip, tooltipItems) {
        return createContext(parent, {
            tooltip,
            tooltipItems,
            type: 'tooltip'
        });
    }
    function overrideCallbacks(callbacks, context) {
        const override = context && context.dataset && context.dataset.tooltip && context.dataset.tooltip.callbacks;
        return override ? callbacks.override(override) : callbacks;
    }
    class Tooltip extends Element {
        constructor(config) {
            super();
            this.opacity = 0;
            this._active = [];
            this._eventPosition = undefined;
            this._size = undefined;
            this._cachedAnimations = undefined;
            this._tooltipItems = [];
            this.$animations = undefined;
            this.$context = undefined;
            this.chart = config.chart || config._chart;
            this._chart = this.chart;
            this.options = config.options;
            this.dataPoints = undefined;
            this.title = undefined;
            this.beforeBody = undefined;
            this.body = undefined;
            this.afterBody = undefined;
            this.footer = undefined;
            this.xAlign = undefined;
            this.yAlign = undefined;
            this.x = undefined;
            this.y = undefined;
            this.height = undefined;
            this.width = undefined;
            this.caretX = undefined;
            this.caretY = undefined;
            this.labelColors = undefined;
            this.labelPointStyles = undefined;
            this.labelTextColors = undefined;
        }
        initialize(options) {
            this.options = options;
            this._cachedAnimations = undefined;
            this.$context = undefined;
        }
        _resolveAnimations() {
            const cached = this._cachedAnimations;
            if (cached) {
                return cached;
            }
            const chart = this.chart;
            const options = this.options.setContext(this.getContext());
            const opts = options.enabled && chart.options.animation && options.animations;
            const animations = new Animations(this.chart, opts);
            if (opts._cacheable) {
                this._cachedAnimations = Object.freeze(animations);
            }
            return animations;
        }
        getContext() {
            return this.$context ||
                (this.$context = createTooltipContext(this.chart.getContext(), this, this._tooltipItems));
        }
        getTitle(context, options) {
            const {callbacks} = options;
            const beforeTitle = callbacks.beforeTitle.apply(this, [context]);
            const title = callbacks.title.apply(this, [context]);
            const afterTitle = callbacks.afterTitle.apply(this, [context]);
            let lines = [];
            lines = pushOrConcat(lines, splitNewlines(beforeTitle));
            lines = pushOrConcat(lines, splitNewlines(title));
            lines = pushOrConcat(lines, splitNewlines(afterTitle));
            return lines;
        }
        getBeforeBody(tooltipItems, options) {
            return getBeforeAfterBodyLines(options.callbacks.beforeBody.apply(this, [tooltipItems]));
        }
        getBody(tooltipItems, options) {
            const {callbacks} = options;
            const bodyItems = [];
            each(tooltipItems, (context) => {
                const bodyItem = {
                    before: [],
                    lines: [],
                    after: []
                };
                const scoped = overrideCallbacks(callbacks, context);
                pushOrConcat(bodyItem.before, splitNewlines(scoped.beforeLabel.call(this, context)));
                pushOrConcat(bodyItem.lines, scoped.label.call(this, context));
                pushOrConcat(bodyItem.after, splitNewlines(scoped.afterLabel.call(this, context)));
                bodyItems.push(bodyItem);
            });
            return bodyItems;
        }
        getAfterBody(tooltipItems, options) {
            return getBeforeAfterBodyLines(options.callbacks.afterBody.apply(this, [tooltipItems]));
        }
        getFooter(tooltipItems, options) {
            const {callbacks} = options;
            const beforeFooter = callbacks.beforeFooter.apply(this, [tooltipItems]);
            const footer = callbacks.footer.apply(this, [tooltipItems]);
            const afterFooter = callbacks.afterFooter.apply(this, [tooltipItems]);
            let lines = [];
            lines = pushOrConcat(lines, splitNewlines(beforeFooter));
            lines = pushOrConcat(lines, splitNewlines(footer));
            lines = pushOrConcat(lines, splitNewlines(afterFooter));
            return lines;
        }
        _createItems(options) {
            const active = this._active;
            const data = this.chart.data;
            const labelColors = [];
            const labelPointStyles = [];
            const labelTextColors = [];
            let tooltipItems = [];
            let i, len;
            for (i = 0, len = active.length; i < len; ++i) {
                tooltipItems.push(createTooltipItem(this.chart, active[i]));
            }
            if (options.filter) {
                tooltipItems = tooltipItems.filter((element, index, array) => options.filter(element, index, array, data));
            }
            if (options.itemSort) {
                tooltipItems = tooltipItems.sort((a, b) => options.itemSort(a, b, data));
            }
            each(tooltipItems, (context) => {
                const scoped = overrideCallbacks(options.callbacks, context);
                labelColors.push(scoped.labelColor.call(this, context));
                labelPointStyles.push(scoped.labelPointStyle.call(this, context));
                labelTextColors.push(scoped.labelTextColor.call(this, context));
            });
            this.labelColors = labelColors;
            this.labelPointStyles = labelPointStyles;
            this.labelTextColors = labelTextColors;
            this.dataPoints = tooltipItems;
            return tooltipItems;
        }
        update(changed, replay) {
            const options = this.options.setContext(this.getContext());
            const active = this._active;
            let properties;
            let tooltipItems = [];
            if (!active.length) {
                if (this.opacity !== 0) {
                    properties = {
                        opacity: 0
                    };
                }
            } else {
                const position = positioners[options.position].call(this, active, this._eventPosition);
                tooltipItems = this._createItems(options);
                this.title = this.getTitle(tooltipItems, options);
                this.beforeBody = this.getBeforeBody(tooltipItems, options);
                this.body = this.getBody(tooltipItems, options);
                this.afterBody = this.getAfterBody(tooltipItems, options);
                this.footer = this.getFooter(tooltipItems, options);
                const size = this._size = getTooltipSize(this, options);
                const positionAndSize = Object.assign({}, position, size);
                const alignment = determineAlignment(this.chart, options, positionAndSize);
                const backgroundPoint = getBackgroundPoint(options, positionAndSize, alignment, this.chart);
                this.xAlign = alignment.xAlign;
                this.yAlign = alignment.yAlign;
                properties = {
                    opacity: 1,
                    x: backgroundPoint.x,
                    y: backgroundPoint.y,
                    width: size.width,
                    height: size.height,
                    caretX: position.x,
                    caretY: position.y
                };
            }
            this._tooltipItems = tooltipItems;
            this.$context = undefined;
            if (properties) {
                this._resolveAnimations().update(this, properties);
            }
            if (changed && options.external) {
                options.external.call(this, {chart: this.chart, tooltip: this, replay});
            }
        }
        drawCaret(tooltipPoint, ctx, size, options) {
            const caretPosition = this.getCaretPosition(tooltipPoint, size, options);
            ctx.lineTo(caretPosition.x1, caretPosition.y1);
            ctx.lineTo(caretPosition.x2, caretPosition.y2);
            ctx.lineTo(caretPosition.x3, caretPosition.y3);
        }
        getCaretPosition(tooltipPoint, size, options) {
            const {xAlign, yAlign} = this;
            const {caretSize, cornerRadius} = options;
            const {topLeft, topRight, bottomLeft, bottomRight} = toTRBLCorners(cornerRadius);
            const {x: ptX, y: ptY} = tooltipPoint;
            const {width, height} = size;
            let x1, x2, x3, y1, y2, y3;
            if (yAlign === 'center') {
                y2 = ptY + (height / 2);
                if (xAlign === 'left') {
                    x1 = ptX;
                    x2 = x1 - caretSize;
                    y1 = y2 + caretSize;
                    y3 = y2 - caretSize;
                } else {
                    x1 = ptX + width;
                    x2 = x1 + caretSize;
                    y1 = y2 - caretSize;
                    y3 = y2 + caretSize;
                }
                x3 = x1;
            } else {
                if (xAlign === 'left') {
                    x2 = ptX + Math.max(topLeft, bottomLeft) + (caretSize);
                } else if (xAlign === 'right') {
                    x2 = ptX + width - Math.max(topRight, bottomRight) - caretSize;
                } else {
                    x2 = this.caretX;
                }
                if (yAlign === 'top') {
                    y1 = ptY;
                    y2 = y1 - caretSize;
                    x1 = x2 - caretSize;
                    x3 = x2 + caretSize;
                } else {
                    y1 = ptY + height;
                    y2 = y1 + caretSize;
                    x1 = x2 + caretSize;
                    x3 = x2 - caretSize;
                }
                y3 = y1;
            }
            return {x1, x2, x3, y1, y2, y3};
        }
        drawTitle(pt, ctx, options) {
            const title = this.title;
            const length = title.length;
            let titleFont, titleSpacing, i;
            if (length) {
                const rtlHelper = getRtlAdapter(options.rtl, this.x, this.width);
                pt.x = getAlignedX(this, options.titleAlign, options);
                ctx.textAlign = rtlHelper.textAlign(options.titleAlign);
                ctx.textBaseline = 'middle';
                titleFont = toFont(options.titleFont);
                titleSpacing = options.titleSpacing;
                ctx.fillStyle = options.titleColor;
                ctx.font = titleFont.string;
                for (i = 0; i < length; ++i) {
                    ctx.fillText(title[i], rtlHelper.x(pt.x), pt.y + titleFont.lineHeight / 2);
                    pt.y += titleFont.lineHeight + titleSpacing;
                    if (i + 1 === length) {
                        pt.y += options.titleMarginBottom - titleSpacing;
                    }
                }
            }
        }
        _drawColorBox(ctx, pt, i, rtlHelper, options) {
            const labelColors = this.labelColors[i];
            const labelPointStyle = this.labelPointStyles[i];
            const {boxHeight, boxWidth, boxPadding} = options;
            const bodyFont = toFont(options.bodyFont);
            const colorX = getAlignedX(this, 'left', options);
            const rtlColorX = rtlHelper.x(colorX);
            const yOffSet = boxHeight < bodyFont.lineHeight ? (bodyFont.lineHeight - boxHeight) / 2 : 0;
            const colorY = pt.y + yOffSet;
            if (options.usePointStyle) {
                const drawOptions = {
                    radius: Math.min(boxWidth, boxHeight) / 2,
                    pointStyle: labelPointStyle.pointStyle,
                    rotation: labelPointStyle.rotation,
                    borderWidth: 1
                };
                const centerX = rtlHelper.leftForLtr(rtlColorX, boxWidth) + boxWidth / 2;
                const centerY = colorY + boxHeight / 2;
                ctx.strokeStyle = options.multiKeyBackground;
                ctx.fillStyle = options.multiKeyBackground;
                drawPoint(ctx, drawOptions, centerX, centerY);
                ctx.strokeStyle = labelColors.borderColor;
                ctx.fillStyle = labelColors.backgroundColor;
                drawPoint(ctx, drawOptions, centerX, centerY);
            } else {
                ctx.lineWidth = isObject(labelColors.borderWidth) ? Math.max(...Object.values(labelColors.borderWidth)) : (labelColors.borderWidth || 1);
                ctx.strokeStyle = labelColors.borderColor;
                ctx.setLineDash(labelColors.borderDash || []);
                ctx.lineDashOffset = labelColors.borderDashOffset || 0;
                const outerX = rtlHelper.leftForLtr(rtlColorX, boxWidth - boxPadding);
                const innerX = rtlHelper.leftForLtr(rtlHelper.xPlus(rtlColorX, 1), boxWidth - boxPadding - 2);
                const borderRadius = toTRBLCorners(labelColors.borderRadius);
                if (Object.values(borderRadius).some(v => v !== 0)) {
                    ctx.beginPath();
                    ctx.fillStyle = options.multiKeyBackground;
                    addRoundedRectPath(ctx, {
                        x: outerX,
                        y: colorY,
                        w: boxWidth,
                        h: boxHeight,
                        radius: borderRadius,
                    });
                    ctx.fill();
                    ctx.stroke();
                    ctx.fillStyle = labelColors.backgroundColor;
                    ctx.beginPath();
                    addRoundedRectPath(ctx, {
                        x: innerX,
                        y: colorY + 1,
                        w: boxWidth - 2,
                        h: boxHeight - 2,
                        radius: borderRadius,
                    });
                    ctx.fill();
                } else {
                    ctx.fillStyle = options.multiKeyBackground;
                    ctx.fillRect(outerX, colorY, boxWidth, boxHeight);
                    ctx.strokeRect(outerX, colorY, boxWidth, boxHeight);
                    ctx.fillStyle = labelColors.backgroundColor;
                    ctx.fillRect(innerX, colorY + 1, boxWidth - 2, boxHeight - 2);
                }
            }
            ctx.fillStyle = this.labelTextColors[i];
        }
        drawBody(pt, ctx, options) {
            const {body} = this;
            const {bodySpacing, bodyAlign, displayColors, boxHeight, boxWidth, boxPadding} = options;
            const bodyFont = toFont(options.bodyFont);
            let bodyLineHeight = bodyFont.lineHeight;
            let xLinePadding = 0;
            const rtlHelper = getRtlAdapter(options.rtl, this.x, this.width);
            const fillLineOfText = function(line) {
                ctx.fillText(line, rtlHelper.x(pt.x + xLinePadding), pt.y + bodyLineHeight / 2);
                pt.y += bodyLineHeight + bodySpacing;
            };
            const bodyAlignForCalculation = rtlHelper.textAlign(bodyAlign);
            let bodyItem, textColor, lines, i, j, ilen, jlen;
            ctx.textAlign = bodyAlign;
            ctx.textBaseline = 'middle';
            ctx.font = bodyFont.string;
            pt.x = getAlignedX(this, bodyAlignForCalculation, options);
            ctx.fillStyle = options.bodyColor;
            each(this.beforeBody, fillLineOfText);
            xLinePadding = displayColors && bodyAlignForCalculation !== 'right'
                ? bodyAlign === 'center' ? (boxWidth / 2 + boxPadding) : (boxWidth + 2 + boxPadding)
                : 0;
            for (i = 0, ilen = body.length; i < ilen; ++i) {
                bodyItem = body[i];
                textColor = this.labelTextColors[i];
                ctx.fillStyle = textColor;
                each(bodyItem.before, fillLineOfText);
                lines = bodyItem.lines;
                if (displayColors && lines.length) {
                    this._drawColorBox(ctx, pt, i, rtlHelper, options);
                    bodyLineHeight = Math.max(bodyFont.lineHeight, boxHeight);
                }
                for (j = 0, jlen = lines.length; j < jlen; ++j) {
                    fillLineOfText(lines[j]);
                    bodyLineHeight = bodyFont.lineHeight;
                }
                each(bodyItem.after, fillLineOfText);
            }
            xLinePadding = 0;
            bodyLineHeight = bodyFont.lineHeight;
            each(this.afterBody, fillLineOfText);
            pt.y -= bodySpacing;
        }
        drawFooter(pt, ctx, options) {
            const footer = this.footer;
            const length = footer.length;
            let footerFont, i;
            if (length) {
                const rtlHelper = getRtlAdapter(options.rtl, this.x, this.width);
                pt.x = getAlignedX(this, options.footerAlign, options);
                pt.y += options.footerMarginTop;
                ctx.textAlign = rtlHelper.textAlign(options.footerAlign);
                ctx.textBaseline = 'middle';
                footerFont = toFont(options.footerFont);
                ctx.fillStyle = options.footerColor;
                ctx.font = footerFont.string;
                for (i = 0; i < length; ++i) {
                    ctx.fillText(footer[i], rtlHelper.x(pt.x), pt.y + footerFont.lineHeight / 2);
                    pt.y += footerFont.lineHeight + options.footerSpacing;
                }
            }
        }
        drawBackground(pt, ctx, tooltipSize, options) {
            const {xAlign, yAlign} = this;
            const {x, y} = pt;
            const {width, height} = tooltipSize;
            const {topLeft, topRight, bottomLeft, bottomRight} = toTRBLCorners(options.cornerRadius);
            ctx.fillStyle = options.backgroundColor;
            ctx.strokeStyle = options.borderColor;
            ctx.lineWidth = options.borderWidth;
            ctx.beginPath();
            ctx.moveTo(x + topLeft, y);
            if (yAlign === 'top') {
                this.drawCaret(pt, ctx, tooltipSize, options);
            }
            ctx.lineTo(x + width - topRight, y);
            ctx.quadraticCurveTo(x + width, y, x + width, y + topRight);
            if (yAlign === 'center' && xAlign === 'right') {
                this.drawCaret(pt, ctx, tooltipSize, options);
            }
            ctx.lineTo(x + width, y + height - bottomRight);
            ctx.quadraticCurveTo(x + width, y + height, x + width - bottomRight, y + height);
            if (yAlign === 'bottom') {
                this.drawCaret(pt, ctx, tooltipSize, options);
            }
            ctx.lineTo(x + bottomLeft, y + height);
            ctx.quadraticCurveTo(x, y + height, x, y + height - bottomLeft);
            if (yAlign === 'center' && xAlign === 'left') {
                this.drawCaret(pt, ctx, tooltipSize, options);
            }
            ctx.lineTo(x, y + topLeft);
            ctx.quadraticCurveTo(x, y, x + topLeft, y);
            ctx.closePath();
            ctx.fill();
            if (options.borderWidth > 0) {
                ctx.stroke();
            }
        }
        _updateAnimationTarget(options) {
            const chart = this.chart;
            const anims = this.$animations;
            const animX = anims && anims.x;
            const animY = anims && anims.y;
            if (animX || animY) {
                const position = positioners[options.position].call(this, this._active, this._eventPosition);
                if (!position) {
                    return;
                }
                const size = this._size = getTooltipSize(this, options);
                const positionAndSize = Object.assign({}, position, this._size);
                const alignment = determineAlignment(chart, options, positionAndSize);
                const point = getBackgroundPoint(options, positionAndSize, alignment, chart);
                if (animX._to !== point.x || animY._to !== point.y) {
                    this.xAlign = alignment.xAlign;
                    this.yAlign = alignment.yAlign;
                    this.width = size.width;
                    this.height = size.height;
                    this.caretX = position.x;
                    this.caretY = position.y;
                    this._resolveAnimations().update(this, point);
                }
            }
        }
        _willRender() {
            return !!this.opacity;
        }
        draw(ctx) {
            const options = this.options.setContext(this.getContext());
            let opacity = this.opacity;
            if (!opacity) {
                return;
            }
            this._updateAnimationTarget(options);
            const tooltipSize = {
                width: this.width,
                height: this.height
            };
            const pt = {
                x: this.x,
                y: this.y
            };
            opacity = Math.abs(opacity) < 1e-3 ? 0 : opacity;
            const padding = toPadding(options.padding);
            const hasTooltipContent = this.title.length || this.beforeBody.length || this.body.length || this.afterBody.length || this.footer.length;
            if (options.enabled && hasTooltipContent) {
                ctx.save();
                ctx.globalAlpha = opacity;
                this.drawBackground(pt, ctx, tooltipSize, options);
                overrideTextDirection(ctx, options.textDirection);
                pt.y += padding.top;
                this.drawTitle(pt, ctx, options);
                this.drawBody(pt, ctx, options);
                this.drawFooter(pt, ctx, options);
                restoreTextDirection(ctx, options.textDirection);
                ctx.restore();
            }
        }
        getActiveElements() {
            return this._active || [];
        }
        setActiveElements(activeElements, eventPosition) {
            const lastActive = this._active;
            const active = activeElements.map(({datasetIndex, index}) => {
                const meta = this.chart.getDatasetMeta(datasetIndex);
                if (!meta) {
                    throw new Error('Cannot find a dataset at index ' + datasetIndex);
                }
                return {
                    datasetIndex,
                    element: meta.data[index],
                    index,
                };
            });
            const changed = !_elementsEqual(lastActive, active);
            const positionChanged = this._positionChanged(active, eventPosition);
            if (changed || positionChanged) {
                this._active = active;
                this._eventPosition = eventPosition;
                this._ignoreReplayEvents = true;
                this.update(true);
            }
        }
        handleEvent(e, replay, inChartArea = true) {
            if (replay && this._ignoreReplayEvents) {
                return false;
            }
            this._ignoreReplayEvents = false;
            const options = this.options;
            const lastActive = this._active || [];
            const active = this._getActiveElements(e, lastActive, replay, inChartArea);
            const positionChanged = this._positionChanged(active, e);
            const changed = replay || !_elementsEqual(active, lastActive) || positionChanged;
            if (changed) {
                this._active = active;
                if (options.enabled || options.external) {
                    this._eventPosition = {
                        x: e.x,
                        y: e.y
                    };
                    this.update(true, replay);
                }
            }
            return changed;
        }
        _getActiveElements(e, lastActive, replay, inChartArea) {
            const options = this.options;
            if (e.type === 'mouseout') {
                return [];
            }
            if (!inChartArea) {
                return lastActive;
            }
            const active = this.chart.getElementsAtEventForMode(e, options.mode, options, replay);
            if (options.reverse) {
                active.reverse();
            }
            return active;
        }
        _positionChanged(active, e) {
            const {caretX, caretY, options} = this;
            const position = positioners[options.position].call(this, active, e);
            return position !== false && (caretX !== position.x || caretY !== position.y);
        }
    }
    Tooltip.positioners = positioners;
    var plugin_tooltip = {
        id: 'tooltip',
        _element: Tooltip,
        positioners,
        afterInit(chart, _args, options) {
            if (options) {
                chart.tooltip = new Tooltip({chart, options});
            }
        },
        beforeUpdate(chart, _args, options) {
            if (chart.tooltip) {
                chart.tooltip.initialize(options);
            }
        },
        reset(chart, _args, options) {
            if (chart.tooltip) {
                chart.tooltip.initialize(options);
            }
        },
        afterDraw(chart) {
            const tooltip = chart.tooltip;
            if (tooltip && tooltip._willRender()) {
                const args = {
                    tooltip
                };
                if (chart.notifyPlugins('beforeTooltipDraw', args) === false) {
                    return;
                }
                tooltip.draw(chart.ctx);
                chart.notifyPlugins('afterTooltipDraw', args);
            }
        },
        afterEvent(chart, args) {
            if (chart.tooltip) {
                const useFinalPosition = args.replay;
                if (chart.tooltip.handleEvent(args.event, useFinalPosition, args.inChartArea)) {
                    args.changed = true;
                }
            }
        },
        defaults: {
            enabled: true,
            external: null,
            position: 'average',
            backgroundColor: 'rgba(0,0,0,0.8)',
            titleColor: '#fff',
            titleFont: {
                weight: 'bold',
            },
            titleSpacing: 2,
            titleMarginBottom: 6,
            titleAlign: 'left',
            bodyColor: '#fff',
            bodySpacing: 2,
            bodyFont: {
            },
            bodyAlign: 'left',
            footerColor: '#fff',
            footerSpacing: 2,
            footerMarginTop: 6,
            footerFont: {
                weight: 'bold',
            },
            footerAlign: 'left',
            padding: 6,
            caretPadding: 2,
            caretSize: 5,
            cornerRadius: 6,
            boxHeight: (ctx, opts) => opts.bodyFont.size,
            boxWidth: (ctx, opts) => opts.bodyFont.size,
            multiKeyBackground: '#fff',
            displayColors: true,
            boxPadding: 0,
            borderColor: 'rgba(0,0,0,0)',
            borderWidth: 0,
            animation: {
                duration: 400,
                easing: 'easeOutQuart',
            },
            animations: {
                numbers: {
                    type: 'number',
                    properties: ['x', 'y', 'width', 'height', 'caretX', 'caretY'],
                },
                opacity: {
                    easing: 'linear',
                    duration: 200
                }
            },
            callbacks: {
                beforeTitle: noop,
                title(tooltipItems) {
                    if (tooltipItems.length > 0) {
                        const item = tooltipItems[0];
                        const labels = item.chart.data.labels;
                        const labelCount = labels ? labels.length : 0;
                        if (this && this.options && this.options.mode === 'dataset') {
                            return item.dataset.label || '';
                        } else if (item.label) {
                            return item.label;
                        } else if (labelCount > 0 && item.dataIndex < labelCount) {
                            return labels[item.dataIndex];
                        }
                    }
                    return '';
                },
                afterTitle: noop,
                beforeBody: noop,
                beforeLabel: noop,
                label(tooltipItem) {
                    if (this && this.options && this.options.mode === 'dataset') {
                        return tooltipItem.label + ': ' + tooltipItem.formattedValue || tooltipItem.formattedValue;
                    }
                    let label = tooltipItem.dataset.label || '';
                    if (label) {
                        label += ': ';
                    }
                    const value = tooltipItem.formattedValue;
                    if (!isNullOrUndef(value)) {
                        label += value;
                    }
                    return label;
                },
                labelColor(tooltipItem) {
                    const meta = tooltipItem.chart.getDatasetMeta(tooltipItem.datasetIndex);
                    const options = meta.controller.getStyle(tooltipItem.dataIndex);
                    return {
                        borderColor: options.borderColor,
                        backgroundColor: options.backgroundColor,
                        borderWidth: options.borderWidth,
                        borderDash: options.borderDash,
                        borderDashOffset: options.borderDashOffset,
                        borderRadius: 0,
                    };
                },
                labelTextColor() {
                    return this.options.bodyColor;
                },
                labelPointStyle(tooltipItem) {
                    const meta = tooltipItem.chart.getDatasetMeta(tooltipItem.datasetIndex);
                    const options = meta.controller.getStyle(tooltipItem.dataIndex);
                    return {
                        pointStyle: options.pointStyle,
                        rotation: options.rotation,
                    };
                },
                afterLabel: noop,
                afterBody: noop,
                beforeFooter: noop,
                footer: noop,
                afterFooter: noop
            }
        },
        defaultRoutes: {
            bodyFont: 'font',
            footerFont: 'font',
            titleFont: 'font'
        },
        descriptors: {
            _scriptable: (name) => name !== 'filter' && name !== 'itemSort' && name !== 'external',
            _indexable: false,
            callbacks: {
                _scriptable: false,
                _indexable: false,
            },
            animation: {
                _fallback: false
            },
            animations: {
                _fallback: 'animation'
            }
        },
        additionalOptionScopes: ['interaction']
    };

    var plugins = /*#__PURE__*/Object.freeze({
        __proto__: null,
        Decimation: plugin_decimation,
        Filler: index,
        Legend: plugin_legend,
        SubTitle: plugin_subtitle,
        Title: plugin_title,
        Tooltip: plugin_tooltip
    });

    const addIfString = (labels, raw, index, addedLabels) => {
        if (typeof raw === 'string') {
            index = labels.push(raw) - 1;
            addedLabels.unshift({index, label: raw});
        } else if (isNaN(raw)) {
            index = null;
        }
        return index;
    };
    function findOrAddLabel(labels, raw, index, addedLabels) {
        const first = labels.indexOf(raw);
        if (first === -1) {
            return addIfString(labels, raw, index, addedLabels);
        }
        const last = labels.lastIndexOf(raw);
        return first !== last ? index : first;
    }
    const validIndex = (index, max) => index === null ? null : _limitValue(Math.round(index), 0, max);
    class CategoryScale extends Scale {
        constructor(cfg) {
            super(cfg);
            this._startValue = undefined;
            this._valueRange = 0;
            this._addedLabels = [];
        }
        init(scaleOptions) {
            const added = this._addedLabels;
            if (added.length) {
                const labels = this.getLabels();
                for (const {index, label} of added) {
                    if (labels[index] === label) {
                        labels.splice(index, 1);
                    }
                }
                this._addedLabels = [];
            }
            super.init(scaleOptions);
        }
        parse(raw, index) {
            if (isNullOrUndef(raw)) {
                return null;
            }
            const labels = this.getLabels();
            index = isFinite(index) && labels[index] === raw ? index
                : findOrAddLabel(labels, raw, valueOrDefault(index, raw), this._addedLabels);
            return validIndex(index, labels.length - 1);
        }
        determineDataLimits() {
            const {minDefined, maxDefined} = this.getUserBounds();
            let {min, max} = this.getMinMax(true);
            if (this.options.bounds === 'ticks') {
                if (!minDefined) {
                    min = 0;
                }
                if (!maxDefined) {
                    max = this.getLabels().length - 1;
                }
            }
            this.min = min;
            this.max = max;
        }
        buildTicks() {
            const min = this.min;
            const max = this.max;
            const offset = this.options.offset;
            const ticks = [];
            let labels = this.getLabels();
            labels = (min === 0 && max === labels.length - 1) ? labels : labels.slice(min, max + 1);
            this._valueRange = Math.max(labels.length - (offset ? 0 : 1), 1);
            this._startValue = this.min - (offset ? 0.5 : 0);
            for (let value = min; value <= max; value++) {
                ticks.push({value});
            }
            return ticks;
        }
        getLabelForValue(value) {
            const labels = this.getLabels();
            if (value >= 0 && value < labels.length) {
                return labels[value];
            }
            return value;
        }
        configure() {
            super.configure();
            if (!this.isHorizontal()) {
                this._reversePixels = !this._reversePixels;
            }
        }
        getPixelForValue(value) {
            if (typeof value !== 'number') {
                value = this.parse(value);
            }
            return value === null ? NaN : this.getPixelForDecimal((value - this._startValue) / this._valueRange);
        }
        getPixelForTick(index) {
            const ticks = this.ticks;
            if (index < 0 || index > ticks.length - 1) {
                return null;
            }
            return this.getPixelForValue(ticks[index].value);
        }
        getValueForPixel(pixel) {
            return Math.round(this._startValue + this.getDecimalForPixel(pixel) * this._valueRange);
        }
        getBasePixel() {
            return this.bottom;
        }
    }
    CategoryScale.id = 'category';
    CategoryScale.defaults = {
        ticks: {
            callback: CategoryScale.prototype.getLabelForValue
        }
    };

    function generateTicks$1(generationOptions, dataRange) {
        const ticks = [];
        const MIN_SPACING = 1e-14;
        const {bounds, step, min, max, precision, count, maxTicks, maxDigits, includeBounds} = generationOptions;
        const unit = step || 1;
        const maxSpaces = maxTicks - 1;
        const {min: rmin, max: rmax} = dataRange;
        const minDefined = !isNullOrUndef(min);
        const maxDefined = !isNullOrUndef(max);
        const countDefined = !isNullOrUndef(count);
        const minSpacing = (rmax - rmin) / (maxDigits + 1);
        let spacing = niceNum((rmax - rmin) / maxSpaces / unit) * unit;
        let factor, niceMin, niceMax, numSpaces;
        if (spacing < MIN_SPACING && !minDefined && !maxDefined) {
            return [{value: rmin}, {value: rmax}];
        }
        numSpaces = Math.ceil(rmax / spacing) - Math.floor(rmin / spacing);
        if (numSpaces > maxSpaces) {
            spacing = niceNum(numSpaces * spacing / maxSpaces / unit) * unit;
        }
        if (!isNullOrUndef(precision)) {
            factor = Math.pow(10, precision);
            spacing = Math.ceil(spacing * factor) / factor;
        }
        if (bounds === 'ticks') {
            niceMin = Math.floor(rmin / spacing) * spacing;
            niceMax = Math.ceil(rmax / spacing) * spacing;
        } else {
            niceMin = rmin;
            niceMax = rmax;
        }
        if (minDefined && maxDefined && step && almostWhole((max - min) / step, spacing / 1000)) {
            numSpaces = Math.round(Math.min((max - min) / spacing, maxTicks));
            spacing = (max - min) / numSpaces;
            niceMin = min;
            niceMax = max;
        } else if (countDefined) {
            niceMin = minDefined ? min : niceMin;
            niceMax = maxDefined ? max : niceMax;
            numSpaces = count - 1;
            spacing = (niceMax - niceMin) / numSpaces;
        } else {
            numSpaces = (niceMax - niceMin) / spacing;
            if (almostEquals(numSpaces, Math.round(numSpaces), spacing / 1000)) {
                numSpaces = Math.round(numSpaces);
            } else {
                numSpaces = Math.ceil(numSpaces);
            }
        }
        const decimalPlaces = Math.max(
            _decimalPlaces(spacing),
            _decimalPlaces(niceMin)
        );
        factor = Math.pow(10, isNullOrUndef(precision) ? decimalPlaces : precision);
        niceMin = Math.round(niceMin * factor) / factor;
        niceMax = Math.round(niceMax * factor) / factor;
        let j = 0;
        if (minDefined) {
            if (includeBounds && niceMin !== min) {
                ticks.push({value: min});
                if (niceMin < min) {
                    j++;
                }
                if (almostEquals(Math.round((niceMin + j * spacing) * factor) / factor, min, relativeLabelSize(min, minSpacing, generationOptions))) {
                    j++;
                }
            } else if (niceMin < min) {
                j++;
            }
        }
        for (; j < numSpaces; ++j) {
            ticks.push({value: Math.round((niceMin + j * spacing) * factor) / factor});
        }
        if (maxDefined && includeBounds && niceMax !== max) {
            if (ticks.length && almostEquals(ticks[ticks.length - 1].value, max, relativeLabelSize(max, minSpacing, generationOptions))) {
                ticks[ticks.length - 1].value = max;
            } else {
                ticks.push({value: max});
            }
        } else if (!maxDefined || niceMax === max) {
            ticks.push({value: niceMax});
        }
        return ticks;
    }
    function relativeLabelSize(value, minSpacing, {horizontal, minRotation}) {
        const rad = toRadians(minRotation);
        const ratio = (horizontal ? Math.sin(rad) : Math.cos(rad)) || 0.001;
        const length = 0.75 * minSpacing * ('' + value).length;
        return Math.min(minSpacing / ratio, length);
    }
    class LinearScaleBase extends Scale {
        constructor(cfg) {
            super(cfg);
            this.start = undefined;
            this.end = undefined;
            this._startValue = undefined;
            this._endValue = undefined;
            this._valueRange = 0;
        }
        parse(raw, index) {
            if (isNullOrUndef(raw)) {
                return null;
            }
            if ((typeof raw === 'number' || raw instanceof Number) && !isFinite(+raw)) {
                return null;
            }
            return +raw;
        }
        handleTickRangeOptions() {
            const {beginAtZero} = this.options;
            const {minDefined, maxDefined} = this.getUserBounds();
            let {min, max} = this;
            const setMin = v => (min = minDefined ? min : v);
            const setMax = v => (max = maxDefined ? max : v);
            if (beginAtZero) {
                const minSign = sign(min);
                const maxSign = sign(max);
                if (minSign < 0 && maxSign < 0) {
                    setMax(0);
                } else if (minSign > 0 && maxSign > 0) {
                    setMin(0);
                }
            }
            if (min === max) {
                let offset = 1;
                if (max >= Number.MAX_SAFE_INTEGER || min <= Number.MIN_SAFE_INTEGER) {
                    offset = Math.abs(max * 0.05);
                }
                setMax(max + offset);
                if (!beginAtZero) {
                    setMin(min - offset);
                }
            }
            this.min = min;
            this.max = max;
        }
        getTickLimit() {
            const tickOpts = this.options.ticks;
            let {maxTicksLimit, stepSize} = tickOpts;
            let maxTicks;
            if (stepSize) {
                maxTicks = Math.ceil(this.max / stepSize) - Math.floor(this.min / stepSize) + 1;
                if (maxTicks > 1000) {
                    console.warn(`scales.${this.id}.ticks.stepSize: ${stepSize} would result generating up to ${maxTicks} ticks. Limiting to 1000.`);
                    maxTicks = 1000;
                }
            } else {
                maxTicks = this.computeTickLimit();
                maxTicksLimit = maxTicksLimit || 11;
            }
            if (maxTicksLimit) {
                maxTicks = Math.min(maxTicksLimit, maxTicks);
            }
            return maxTicks;
        }
        computeTickLimit() {
            return Number.POSITIVE_INFINITY;
        }
        buildTicks() {
            const opts = this.options;
            const tickOpts = opts.ticks;
            let maxTicks = this.getTickLimit();
            maxTicks = Math.max(2, maxTicks);
            const numericGeneratorOptions = {
                maxTicks,
                bounds: opts.bounds,
                min: opts.min,
                max: opts.max,
                precision: tickOpts.precision,
                step: tickOpts.stepSize,
                count: tickOpts.count,
                maxDigits: this._maxDigits(),
                horizontal: this.isHorizontal(),
                minRotation: tickOpts.minRotation || 0,
                includeBounds: tickOpts.includeBounds !== false
            };
            const dataRange = this._range || this;
            const ticks = generateTicks$1(numericGeneratorOptions, dataRange);
            if (opts.bounds === 'ticks') {
                _setMinAndMaxByKey(ticks, this, 'value');
            }
            if (opts.reverse) {
                ticks.reverse();
                this.start = this.max;
                this.end = this.min;
            } else {
                this.start = this.min;
                this.end = this.max;
            }
            return ticks;
        }
        configure() {
            const ticks = this.ticks;
            let start = this.min;
            let end = this.max;
            super.configure();
            if (this.options.offset && ticks.length) {
                const offset = (end - start) / Math.max(ticks.length - 1, 1) / 2;
                start -= offset;
                end += offset;
            }
            this._startValue = start;
            this._endValue = end;
            this._valueRange = end - start;
        }
        getLabelForValue(value) {
            return formatNumber(value, this.chart.options.locale, this.options.ticks.format);
        }
    }

    class LinearScale extends LinearScaleBase {
        determineDataLimits() {
            const {min, max} = this.getMinMax(true);
            this.min = isNumberFinite(min) ? min : 0;
            this.max = isNumberFinite(max) ? max : 1;
            this.handleTickRangeOptions();
        }
        computeTickLimit() {
            const horizontal = this.isHorizontal();
            const length = horizontal ? this.width : this.height;
            const minRotation = toRadians(this.options.ticks.minRotation);
            const ratio = (horizontal ? Math.sin(minRotation) : Math.cos(minRotation)) || 0.001;
            const tickFont = this._resolveTickFontOptions(0);
            return Math.ceil(length / Math.min(40, tickFont.lineHeight / ratio));
        }
        getPixelForValue(value) {
            return value === null ? NaN : this.getPixelForDecimal((value - this._startValue) / this._valueRange);
        }
        getValueForPixel(pixel) {
            return this._startValue + this.getDecimalForPixel(pixel) * this._valueRange;
        }
    }
    LinearScale.id = 'linear';
    LinearScale.defaults = {
        ticks: {
            callback: Ticks.formatters.numeric
        }
    };

    function isMajor(tickVal) {
        const remain = tickVal / (Math.pow(10, Math.floor(log10(tickVal))));
        return remain === 1;
    }
    function generateTicks(generationOptions, dataRange) {
        const endExp = Math.floor(log10(dataRange.max));
        const endSignificand = Math.ceil(dataRange.max / Math.pow(10, endExp));
        const ticks = [];
        let tickVal = finiteOrDefault(generationOptions.min, Math.pow(10, Math.floor(log10(dataRange.min))));
        let exp = Math.floor(log10(tickVal));
        let significand = Math.floor(tickVal / Math.pow(10, exp));
        let precision = exp < 0 ? Math.pow(10, Math.abs(exp)) : 1;
        do {
            ticks.push({value: tickVal, major: isMajor(tickVal)});
            ++significand;
            if (significand === 10) {
                significand = 1;
                ++exp;
                precision = exp >= 0 ? 1 : precision;
            }
            tickVal = Math.round(significand * Math.pow(10, exp) * precision) / precision;
        } while (exp < endExp || (exp === endExp && significand < endSignificand));
        const lastTick = finiteOrDefault(generationOptions.max, tickVal);
        ticks.push({value: lastTick, major: isMajor(tickVal)});
        return ticks;
    }
    class LogarithmicScale extends Scale {
        constructor(cfg) {
            super(cfg);
            this.start = undefined;
            this.end = undefined;
            this._startValue = undefined;
            this._valueRange = 0;
        }
        parse(raw, index) {
            const value = LinearScaleBase.prototype.parse.apply(this, [raw, index]);
            if (value === 0) {
                this._zero = true;
                return undefined;
            }
            return isNumberFinite(value) && value > 0 ? value : null;
        }
        determineDataLimits() {
            const {min, max} = this.getMinMax(true);
            this.min = isNumberFinite(min) ? Math.max(0, min) : null;
            this.max = isNumberFinite(max) ? Math.max(0, max) : null;
            if (this.options.beginAtZero) {
                this._zero = true;
            }
            this.handleTickRangeOptions();
        }
        handleTickRangeOptions() {
            const {minDefined, maxDefined} = this.getUserBounds();
            let min = this.min;
            let max = this.max;
            const setMin = v => (min = minDefined ? min : v);
            const setMax = v => (max = maxDefined ? max : v);
            const exp = (v, m) => Math.pow(10, Math.floor(log10(v)) + m);
            if (min === max) {
                if (min <= 0) {
                    setMin(1);
                    setMax(10);
                } else {
                    setMin(exp(min, -1));
                    setMax(exp(max, +1));
                }
            }
            if (min <= 0) {
                setMin(exp(max, -1));
            }
            if (max <= 0) {
                setMax(exp(min, +1));
            }
            if (this._zero && this.min !== this._suggestedMin && min === exp(this.min, 0)) {
                setMin(exp(min, -1));
            }
            this.min = min;
            this.max = max;
        }
        buildTicks() {
            const opts = this.options;
            const generationOptions = {
                min: this._userMin,
                max: this._userMax
            };
            const ticks = generateTicks(generationOptions, this);
            if (opts.bounds === 'ticks') {
                _setMinAndMaxByKey(ticks, this, 'value');
            }
            if (opts.reverse) {
                ticks.reverse();
                this.start = this.max;
                this.end = this.min;
            } else {
                this.start = this.min;
                this.end = this.max;
            }
            return ticks;
        }
        getLabelForValue(value) {
            return value === undefined
                ? '0'
                : formatNumber(value, this.chart.options.locale, this.options.ticks.format);
        }
        configure() {
            const start = this.min;
            super.configure();
            this._startValue = log10(start);
            this._valueRange = log10(this.max) - log10(start);
        }
        getPixelForValue(value) {
            if (value === undefined || value === 0) {
                value = this.min;
            }
            if (value === null || isNaN(value)) {
                return NaN;
            }
            return this.getPixelForDecimal(value === this.min
                ? 0
                : (log10(value) - this._startValue) / this._valueRange);
        }
        getValueForPixel(pixel) {
            const decimal = this.getDecimalForPixel(pixel);
            return Math.pow(10, this._startValue + decimal * this._valueRange);
        }
    }
    LogarithmicScale.id = 'logarithmic';
    LogarithmicScale.defaults = {
        ticks: {
            callback: Ticks.formatters.logarithmic,
            major: {
                enabled: true
            }
        }
    };

    function getTickBackdropHeight(opts) {
        const tickOpts = opts.ticks;
        if (tickOpts.display && opts.display) {
            const padding = toPadding(tickOpts.backdropPadding);
            return valueOrDefault(tickOpts.font && tickOpts.font.size, defaults.font.size) + padding.height;
        }
        return 0;
    }
    function measureLabelSize(ctx, font, label) {
        label = isArray(label) ? label : [label];
        return {
            w: _longestText(ctx, font.string, label),
            h: label.length * font.lineHeight
        };
    }
    function determineLimits(angle, pos, size, min, max) {
        if (angle === min || angle === max) {
            return {
                start: pos - (size / 2),
                end: pos + (size / 2)
            };
        } else if (angle < min || angle > max) {
            return {
                start: pos - size,
                end: pos
            };
        }
        return {
            start: pos,
            end: pos + size
        };
    }
    function fitWithPointLabels(scale) {
        const orig = {
            l: scale.left + scale._padding.left,
            r: scale.right - scale._padding.right,
            t: scale.top + scale._padding.top,
            b: scale.bottom - scale._padding.bottom
        };
        const limits = Object.assign({}, orig);
        const labelSizes = [];
        const padding = [];
        const valueCount = scale._pointLabels.length;
        const pointLabelOpts = scale.options.pointLabels;
        const additionalAngle = pointLabelOpts.centerPointLabels ? PI / valueCount : 0;
        for (let i = 0; i < valueCount; i++) {
            const opts = pointLabelOpts.setContext(scale.getPointLabelContext(i));
            padding[i] = opts.padding;
            const pointPosition = scale.getPointPosition(i, scale.drawingArea + padding[i], additionalAngle);
            const plFont = toFont(opts.font);
            const textSize = measureLabelSize(scale.ctx, plFont, scale._pointLabels[i]);
            labelSizes[i] = textSize;
            const angleRadians = _normalizeAngle(scale.getIndexAngle(i) + additionalAngle);
            const angle = Math.round(toDegrees(angleRadians));
            const hLimits = determineLimits(angle, pointPosition.x, textSize.w, 0, 180);
            const vLimits = determineLimits(angle, pointPosition.y, textSize.h, 90, 270);
            updateLimits(limits, orig, angleRadians, hLimits, vLimits);
        }
        scale.setCenterPoint(
            orig.l - limits.l,
            limits.r - orig.r,
            orig.t - limits.t,
            limits.b - orig.b
        );
        scale._pointLabelItems = buildPointLabelItems(scale, labelSizes, padding);
    }
    function updateLimits(limits, orig, angle, hLimits, vLimits) {
        const sin = Math.abs(Math.sin(angle));
        const cos = Math.abs(Math.cos(angle));
        let x = 0;
        let y = 0;
        if (hLimits.start < orig.l) {
            x = (orig.l - hLimits.start) / sin;
            limits.l = Math.min(limits.l, orig.l - x);
        } else if (hLimits.end > orig.r) {
            x = (hLimits.end - orig.r) / sin;
            limits.r = Math.max(limits.r, orig.r + x);
        }
        if (vLimits.start < orig.t) {
            y = (orig.t - vLimits.start) / cos;
            limits.t = Math.min(limits.t, orig.t - y);
        } else if (vLimits.end > orig.b) {
            y = (vLimits.end - orig.b) / cos;
            limits.b = Math.max(limits.b, orig.b + y);
        }
    }
    function buildPointLabelItems(scale, labelSizes, padding) {
        const items = [];
        const valueCount = scale._pointLabels.length;
        const opts = scale.options;
        const extra = getTickBackdropHeight(opts) / 2;
        const outerDistance = scale.drawingArea;
        const additionalAngle = opts.pointLabels.centerPointLabels ? PI / valueCount : 0;
        for (let i = 0; i < valueCount; i++) {
            const pointLabelPosition = scale.getPointPosition(i, outerDistance + extra + padding[i], additionalAngle);
            const angle = Math.round(toDegrees(_normalizeAngle(pointLabelPosition.angle + HALF_PI)));
            const size = labelSizes[i];
            const y = yForAngle(pointLabelPosition.y, size.h, angle);
            const textAlign = getTextAlignForAngle(angle);
            const left = leftForTextAlign(pointLabelPosition.x, size.w, textAlign);
            items.push({
                x: pointLabelPosition.x,
                y,
                textAlign,
                left,
                top: y,
                right: left + size.w,
                bottom: y + size.h
            });
        }
        return items;
    }
    function getTextAlignForAngle(angle) {
        if (angle === 0 || angle === 180) {
            return 'center';
        } else if (angle < 180) {
            return 'left';
        }
        return 'right';
    }
    function leftForTextAlign(x, w, align) {
        if (align === 'right') {
            x -= w;
        } else if (align === 'center') {
            x -= (w / 2);
        }
        return x;
    }
    function yForAngle(y, h, angle) {
        if (angle === 90 || angle === 270) {
            y -= (h / 2);
        } else if (angle > 270 || angle < 90) {
            y -= h;
        }
        return y;
    }
    function drawPointLabels(scale, labelCount) {
        const {ctx, options: {pointLabels}} = scale;
        for (let i = labelCount - 1; i >= 0; i--) {
            const optsAtIndex = pointLabels.setContext(scale.getPointLabelContext(i));
            const plFont = toFont(optsAtIndex.font);
            const {x, y, textAlign, left, top, right, bottom} = scale._pointLabelItems[i];
            const {backdropColor} = optsAtIndex;
            if (!isNullOrUndef(backdropColor)) {
                const borderRadius = toTRBLCorners(optsAtIndex.borderRadius);
                const padding = toPadding(optsAtIndex.backdropPadding);
                ctx.fillStyle = backdropColor;
                const backdropLeft = left - padding.left;
                const backdropTop = top - padding.top;
                const backdropWidth = right - left + padding.width;
                const backdropHeight = bottom - top + padding.height;
                if (Object.values(borderRadius).some(v => v !== 0)) {
                    ctx.beginPath();
                    addRoundedRectPath(ctx, {
                        x: backdropLeft,
                        y: backdropTop,
                        w: backdropWidth,
                        h: backdropHeight,
                        radius: borderRadius,
                    });
                    ctx.fill();
                } else {
                    ctx.fillRect(backdropLeft, backdropTop, backdropWidth, backdropHeight);
                }
            }
            renderText(
                ctx,
                scale._pointLabels[i],
                x,
                y + (plFont.lineHeight / 2),
                plFont,
                {
                    color: optsAtIndex.color,
                    textAlign: textAlign,
                    textBaseline: 'middle'
                }
            );
        }
    }
    function pathRadiusLine(scale, radius, circular, labelCount) {
        const {ctx} = scale;
        if (circular) {
            ctx.arc(scale.xCenter, scale.yCenter, radius, 0, TAU);
        } else {
            let pointPosition = scale.getPointPosition(0, radius);
            ctx.moveTo(pointPosition.x, pointPosition.y);
            for (let i = 1; i < labelCount; i++) {
                pointPosition = scale.getPointPosition(i, radius);
                ctx.lineTo(pointPosition.x, pointPosition.y);
            }
        }
    }
    function drawRadiusLine(scale, gridLineOpts, radius, labelCount) {
        const ctx = scale.ctx;
        const circular = gridLineOpts.circular;
        const {color, lineWidth} = gridLineOpts;
        if ((!circular && !labelCount) || !color || !lineWidth || radius < 0) {
            return;
        }
        ctx.save();
        ctx.strokeStyle = color;
        ctx.lineWidth = lineWidth;
        ctx.setLineDash(gridLineOpts.borderDash);
        ctx.lineDashOffset = gridLineOpts.borderDashOffset;
        ctx.beginPath();
        pathRadiusLine(scale, radius, circular, labelCount);
        ctx.closePath();
        ctx.stroke();
        ctx.restore();
    }
    function createPointLabelContext(parent, index, label) {
        return createContext(parent, {
            label,
            index,
            type: 'pointLabel'
        });
    }
    class RadialLinearScale extends LinearScaleBase {
        constructor(cfg) {
            super(cfg);
            this.xCenter = undefined;
            this.yCenter = undefined;
            this.drawingArea = undefined;
            this._pointLabels = [];
            this._pointLabelItems = [];
        }
        setDimensions() {
            const padding = this._padding = toPadding(getTickBackdropHeight(this.options) / 2);
            const w = this.width = this.maxWidth - padding.width;
            const h = this.height = this.maxHeight - padding.height;
            this.xCenter = Math.floor(this.left + w / 2 + padding.left);
            this.yCenter = Math.floor(this.top + h / 2 + padding.top);
            this.drawingArea = Math.floor(Math.min(w, h) / 2);
        }
        determineDataLimits() {
            const {min, max} = this.getMinMax(false);
            this.min = isNumberFinite(min) && !isNaN(min) ? min : 0;
            this.max = isNumberFinite(max) && !isNaN(max) ? max : 0;
            this.handleTickRangeOptions();
        }
        computeTickLimit() {
            return Math.ceil(this.drawingArea / getTickBackdropHeight(this.options));
        }
        generateTickLabels(ticks) {
            LinearScaleBase.prototype.generateTickLabels.call(this, ticks);
            this._pointLabels = this.getLabels()
                .map((value, index) => {
                    const label = callback(this.options.pointLabels.callback, [value, index], this);
                    return label || label === 0 ? label : '';
                })
                .filter((v, i) => this.chart.getDataVisibility(i));
        }
        fit() {
            const opts = this.options;
            if (opts.display && opts.pointLabels.display) {
                fitWithPointLabels(this);
            } else {
                this.setCenterPoint(0, 0, 0, 0);
            }
        }
        setCenterPoint(leftMovement, rightMovement, topMovement, bottomMovement) {
            this.xCenter += Math.floor((leftMovement - rightMovement) / 2);
            this.yCenter += Math.floor((topMovement - bottomMovement) / 2);
            this.drawingArea -= Math.min(this.drawingArea / 2, Math.max(leftMovement, rightMovement, topMovement, bottomMovement));
        }
        getIndexAngle(index) {
            const angleMultiplier = TAU / (this._pointLabels.length || 1);
            const startAngle = this.options.startAngle || 0;
            return _normalizeAngle(index * angleMultiplier + toRadians(startAngle));
        }
        getDistanceFromCenterForValue(value) {
            if (isNullOrUndef(value)) {
                return NaN;
            }
            const scalingFactor = this.drawingArea / (this.max - this.min);
            if (this.options.reverse) {
                return (this.max - value) * scalingFactor;
            }
            return (value - this.min) * scalingFactor;
        }
        getValueForDistanceFromCenter(distance) {
            if (isNullOrUndef(distance)) {
                return NaN;
            }
            const scaledDistance = distance / (this.drawingArea / (this.max - this.min));
            return this.options.reverse ? this.max - scaledDistance : this.min + scaledDistance;
        }
        getPointLabelContext(index) {
            const pointLabels = this._pointLabels || [];
            if (index >= 0 && index < pointLabels.length) {
                const pointLabel = pointLabels[index];
                return createPointLabelContext(this.getContext(), index, pointLabel);
            }
        }
        getPointPosition(index, distanceFromCenter, additionalAngle = 0) {
            const angle = this.getIndexAngle(index) - HALF_PI + additionalAngle;
            return {
                x: Math.cos(angle) * distanceFromCenter + this.xCenter,
                y: Math.sin(angle) * distanceFromCenter + this.yCenter,
                angle
            };
        }
        getPointPositionForValue(index, value) {
            return this.getPointPosition(index, this.getDistanceFromCenterForValue(value));
        }
        getBasePosition(index) {
            return this.getPointPositionForValue(index || 0, this.getBaseValue());
        }
        getPointLabelPosition(index) {
            const {left, top, right, bottom} = this._pointLabelItems[index];
            return {
                left,
                top,
                right,
                bottom,
            };
        }
        drawBackground() {
            const {backgroundColor, grid: {circular}} = this.options;
            if (backgroundColor) {
                const ctx = this.ctx;
                ctx.save();
                ctx.beginPath();
                pathRadiusLine(this, this.getDistanceFromCenterForValue(this._endValue), circular, this._pointLabels.length);
                ctx.closePath();
                ctx.fillStyle = backgroundColor;
                ctx.fill();
                ctx.restore();
            }
        }
        drawGrid() {
            const ctx = this.ctx;
            const opts = this.options;
            const {angleLines, grid} = opts;
            const labelCount = this._pointLabels.length;
            let i, offset, position;
            if (opts.pointLabels.display) {
                drawPointLabels(this, labelCount);
            }
            if (grid.display) {
                this.ticks.forEach((tick, index) => {
                    if (index !== 0) {
                        offset = this.getDistanceFromCenterForValue(tick.value);
                        const optsAtIndex = grid.setContext(this.getContext(index - 1));
                        drawRadiusLine(this, optsAtIndex, offset, labelCount);
                    }
                });
            }
            if (angleLines.display) {
                ctx.save();
                for (i = labelCount - 1; i >= 0; i--) {
                    const optsAtIndex = angleLines.setContext(this.getPointLabelContext(i));
                    const {color, lineWidth} = optsAtIndex;
                    if (!lineWidth || !color) {
                        continue;
                    }
                    ctx.lineWidth = lineWidth;
                    ctx.strokeStyle = color;
                    ctx.setLineDash(optsAtIndex.borderDash);
                    ctx.lineDashOffset = optsAtIndex.borderDashOffset;
                    offset = this.getDistanceFromCenterForValue(opts.ticks.reverse ? this.min : this.max);
                    position = this.getPointPosition(i, offset);
                    ctx.beginPath();
                    ctx.moveTo(this.xCenter, this.yCenter);
                    ctx.lineTo(position.x, position.y);
                    ctx.stroke();
                }
                ctx.restore();
            }
        }
        drawBorder() {}
        drawLabels() {
            const ctx = this.ctx;
            const opts = this.options;
            const tickOpts = opts.ticks;
            if (!tickOpts.display) {
                return;
            }
            const startAngle = this.getIndexAngle(0);
            let offset, width;
            ctx.save();
            ctx.translate(this.xCenter, this.yCenter);
            ctx.rotate(startAngle);
            ctx.textAlign = 'center';
            ctx.textBaseline = 'middle';
            this.ticks.forEach((tick, index) => {
                if (index === 0 && !opts.reverse) {
                    return;
                }
                const optsAtIndex = tickOpts.setContext(this.getContext(index));
                const tickFont = toFont(optsAtIndex.font);
                offset = this.getDistanceFromCenterForValue(this.ticks[index].value);
                if (optsAtIndex.showLabelBackdrop) {
                    ctx.font = tickFont.string;
                    width = ctx.measureText(tick.label).width;
                    ctx.fillStyle = optsAtIndex.backdropColor;
                    const padding = toPadding(optsAtIndex.backdropPadding);
                    ctx.fillRect(
                        -width / 2 - padding.left,
                        -offset - tickFont.size / 2 - padding.top,
                        width + padding.width,
                        tickFont.size + padding.height
                    );
                }
                renderText(ctx, tick.label, 0, -offset, tickFont, {
                    color: optsAtIndex.color,
                });
            });
            ctx.restore();
        }
        drawTitle() {}
    }
    RadialLinearScale.id = 'radialLinear';
    RadialLinearScale.defaults = {
        display: true,
        animate: true,
        position: 'chartArea',
        angleLines: {
            display: true,
            lineWidth: 1,
            borderDash: [],
            borderDashOffset: 0.0
        },
        grid: {
            circular: false
        },
        startAngle: 0,
        ticks: {
            showLabelBackdrop: true,
            callback: Ticks.formatters.numeric
        },
        pointLabels: {
            backdropColor: undefined,
            backdropPadding: 2,
            display: true,
            font: {
                size: 10
            },
            callback(label) {
                return label;
            },
            padding: 5,
            centerPointLabels: false
        }
    };
    RadialLinearScale.defaultRoutes = {
        'angleLines.color': 'borderColor',
        'pointLabels.color': 'color',
        'ticks.color': 'color'
    };
    RadialLinearScale.descriptors = {
        angleLines: {
            _fallback: 'grid'
        }
    };

    const INTERVALS = {
        millisecond: {common: true, size: 1, steps: 1000},
        second: {common: true, size: 1000, steps: 60},
        minute: {common: true, size: 60000, steps: 60},
        hour: {common: true, size: 3600000, steps: 24},
        day: {common: true, size: 86400000, steps: 30},
        week: {common: false, size: 604800000, steps: 4},
        month: {common: true, size: 2.628e9, steps: 12},
        quarter: {common: false, size: 7.884e9, steps: 4},
        year: {common: true, size: 3.154e10}
    };
    const UNITS = (Object.keys(INTERVALS));
    function sorter(a, b) {
        return a - b;
    }
    function parse(scale, input) {
        if (isNullOrUndef(input)) {
            return null;
        }
        const adapter = scale._adapter;
        const {parser, round, isoWeekday} = scale._parseOpts;
        let value = input;
        if (typeof parser === 'function') {
            value = parser(value);
        }
        if (!isNumberFinite(value)) {
            value = typeof parser === 'string'
                ? adapter.parse(value, parser)
                : adapter.parse(value);
        }
        if (value === null) {
            return null;
        }
        if (round) {
            value = round === 'week' && (isNumber(isoWeekday) || isoWeekday === true)
                ? adapter.startOf(value, 'isoWeek', isoWeekday)
                : adapter.startOf(value, round);
        }
        return +value;
    }
    function determineUnitForAutoTicks(minUnit, min, max, capacity) {
        const ilen = UNITS.length;
        for (let i = UNITS.indexOf(minUnit); i < ilen - 1; ++i) {
            const interval = INTERVALS[UNITS[i]];
            const factor = interval.steps ? interval.steps : Number.MAX_SAFE_INTEGER;
            if (interval.common && Math.ceil((max - min) / (factor * interval.size)) <= capacity) {
                return UNITS[i];
            }
        }
        return UNITS[ilen - 1];
    }
    function determineUnitForFormatting(scale, numTicks, minUnit, min, max) {
        for (let i = UNITS.length - 1; i >= UNITS.indexOf(minUnit); i--) {
            const unit = UNITS[i];
            if (INTERVALS[unit].common && scale._adapter.diff(max, min, unit) >= numTicks - 1) {
                return unit;
            }
        }
        return UNITS[minUnit ? UNITS.indexOf(minUnit) : 0];
    }
    function determineMajorUnit(unit) {
        for (let i = UNITS.indexOf(unit) + 1, ilen = UNITS.length; i < ilen; ++i) {
            if (INTERVALS[UNITS[i]].common) {
                return UNITS[i];
            }
        }
    }
    function addTick(ticks, time, timestamps) {
        if (!timestamps) {
            ticks[time] = true;
        } else if (timestamps.length) {
            const {lo, hi} = _lookup(timestamps, time);
            const timestamp = timestamps[lo] >= time ? timestamps[lo] : timestamps[hi];
            ticks[timestamp] = true;
        }
    }
    function setMajorTicks(scale, ticks, map, majorUnit) {
        const adapter = scale._adapter;
        const first = +adapter.startOf(ticks[0].value, majorUnit);
        const last = ticks[ticks.length - 1].value;
        let major, index;
        for (major = first; major <= last; major = +adapter.add(major, 1, majorUnit)) {
            index = map[major];
            if (index >= 0) {
                ticks[index].major = true;
            }
        }
        return ticks;
    }
    function ticksFromTimestamps(scale, values, majorUnit) {
        const ticks = [];
        const map = {};
        const ilen = values.length;
        let i, value;
        for (i = 0; i < ilen; ++i) {
            value = values[i];
            map[value] = i;
            ticks.push({
                value,
                major: false
            });
        }
        return (ilen === 0 || !majorUnit) ? ticks : setMajorTicks(scale, ticks, map, majorUnit);
    }
    class TimeScale extends Scale {
        constructor(props) {
            super(props);
            this._cache = {
                data: [],
                labels: [],
                all: []
            };
            this._unit = 'day';
            this._majorUnit = undefined;
            this._offsets = {};
            this._normalized = false;
            this._parseOpts = undefined;
        }
        init(scaleOpts, opts) {
            const time = scaleOpts.time || (scaleOpts.time = {});
            const adapter = this._adapter = new _adapters._date(scaleOpts.adapters.date);
            adapter.init(opts);
            mergeIf(time.displayFormats, adapter.formats());
            this._parseOpts = {
                parser: time.parser,
                round: time.round,
                isoWeekday: time.isoWeekday
            };
            super.init(scaleOpts);
            this._normalized = opts.normalized;
        }
        parse(raw, index) {
            if (raw === undefined) {
                return null;
            }
            return parse(this, raw);
        }
        beforeLayout() {
            super.beforeLayout();
            this._cache = {
                data: [],
                labels: [],
                all: []
            };
        }
        determineDataLimits() {
            const options = this.options;
            const adapter = this._adapter;
            const unit = options.time.unit || 'day';
            let {min, max, minDefined, maxDefined} = this.getUserBounds();
            function _applyBounds(bounds) {
                if (!minDefined && !isNaN(bounds.min)) {
                    min = Math.min(min, bounds.min);
                }
                if (!maxDefined && !isNaN(bounds.max)) {
                    max = Math.max(max, bounds.max);
                }
            }
            if (!minDefined || !maxDefined) {
                _applyBounds(this._getLabelBounds());
                if (options.bounds !== 'ticks' || options.ticks.source !== 'labels') {
                    _applyBounds(this.getMinMax(false));
                }
            }
            min = isNumberFinite(min) && !isNaN(min) ? min : +adapter.startOf(Date.now(), unit);
            max = isNumberFinite(max) && !isNaN(max) ? max : +adapter.endOf(Date.now(), unit) + 1;
            this.min = Math.min(min, max - 1);
            this.max = Math.max(min + 1, max);
        }
        _getLabelBounds() {
            const arr = this.getLabelTimestamps();
            let min = Number.POSITIVE_INFINITY;
            let max = Number.NEGATIVE_INFINITY;
            if (arr.length) {
                min = arr[0];
                max = arr[arr.length - 1];
            }
            return {min, max};
        }
        buildTicks() {
            const options = this.options;
            const timeOpts = options.time;
            const tickOpts = options.ticks;
            const timestamps = tickOpts.source === 'labels' ? this.getLabelTimestamps() : this._generate();
            if (options.bounds === 'ticks' && timestamps.length) {
                this.min = this._userMin || timestamps[0];
                this.max = this._userMax || timestamps[timestamps.length - 1];
            }
            const min = this.min;
            const max = this.max;
            const ticks = _filterBetween(timestamps, min, max);
            this._unit = timeOpts.unit || (tickOpts.autoSkip
                ? determineUnitForAutoTicks(timeOpts.minUnit, this.min, this.max, this._getLabelCapacity(min))
                : determineUnitForFormatting(this, ticks.length, timeOpts.minUnit, this.min, this.max));
            this._majorUnit = !tickOpts.major.enabled || this._unit === 'year' ? undefined
                : determineMajorUnit(this._unit);
            this.initOffsets(timestamps);
            if (options.reverse) {
                ticks.reverse();
            }
            return ticksFromTimestamps(this, ticks, this._majorUnit);
        }
        afterAutoSkip() {
            if (this.options.offsetAfterAutoskip) {
                this.initOffsets(this.ticks.map(tick => +tick.value));
            }
        }
        initOffsets(timestamps) {
            let start = 0;
            let end = 0;
            let first, last;
            if (this.options.offset && timestamps.length) {
                first = this.getDecimalForValue(timestamps[0]);
                if (timestamps.length === 1) {
                    start = 1 - first;
                } else {
                    start = (this.getDecimalForValue(timestamps[1]) - first) / 2;
                }
                last = this.getDecimalForValue(timestamps[timestamps.length - 1]);
                if (timestamps.length === 1) {
                    end = last;
                } else {
                    end = (last - this.getDecimalForValue(timestamps[timestamps.length - 2])) / 2;
                }
            }
            const limit = timestamps.length < 3 ? 0.5 : 0.25;
            start = _limitValue(start, 0, limit);
            end = _limitValue(end, 0, limit);
            this._offsets = {start, end, factor: 1 / (start + 1 + end)};
        }
        _generate() {
            const adapter = this._adapter;
            const min = this.min;
            const max = this.max;
            const options = this.options;
            const timeOpts = options.time;
            const minor = timeOpts.unit || determineUnitForAutoTicks(timeOpts.minUnit, min, max, this._getLabelCapacity(min));
            const stepSize = valueOrDefault(timeOpts.stepSize, 1);
            const weekday = minor === 'week' ? timeOpts.isoWeekday : false;
            const hasWeekday = isNumber(weekday) || weekday === true;
            const ticks = {};
            let first = min;
            let time, count;
            if (hasWeekday) {
                first = +adapter.startOf(first, 'isoWeek', weekday);
            }
            first = +adapter.startOf(first, hasWeekday ? 'day' : minor);
            if (adapter.diff(max, min, minor) > 100000 * stepSize) {
                throw new Error(min + ' and ' + max + ' are too far apart with stepSize of ' + stepSize + ' ' + minor);
            }
            const timestamps = options.ticks.source === 'data' && this.getDataTimestamps();
            for (time = first, count = 0; time < max; time = +adapter.add(time, stepSize, minor), count++) {
                addTick(ticks, time, timestamps);
            }
            if (time === max || options.bounds === 'ticks' || count === 1) {
                addTick(ticks, time, timestamps);
            }
            return Object.keys(ticks).sort((a, b) => a - b).map(x => +x);
        }
        getLabelForValue(value) {
            const adapter = this._adapter;
            const timeOpts = this.options.time;
            if (timeOpts.tooltipFormat) {
                return adapter.format(value, timeOpts.tooltipFormat);
            }
            return adapter.format(value, timeOpts.displayFormats.datetime);
        }
        _tickFormatFunction(time, index, ticks, format) {
            const options = this.options;
            const formats = options.time.displayFormats;
            const unit = this._unit;
            const majorUnit = this._majorUnit;
            const minorFormat = unit && formats[unit];
            const majorFormat = majorUnit && formats[majorUnit];
            const tick = ticks[index];
            const major = majorUnit && majorFormat && tick && tick.major;
            const label = this._adapter.format(time, format || (major ? majorFormat : minorFormat));
            const formatter = options.ticks.callback;
            return formatter ? callback(formatter, [label, index, ticks], this) : label;
        }
        generateTickLabels(ticks) {
            let i, ilen, tick;
            for (i = 0, ilen = ticks.length; i < ilen; ++i) {
                tick = ticks[i];
                tick.label = this._tickFormatFunction(tick.value, i, ticks);
            }
        }
        getDecimalForValue(value) {
            return value === null ? NaN : (value - this.min) / (this.max - this.min);
        }
        getPixelForValue(value) {
            const offsets = this._offsets;
            const pos = this.getDecimalForValue(value);
            return this.getPixelForDecimal((offsets.start + pos) * offsets.factor);
        }
        getValueForPixel(pixel) {
            const offsets = this._offsets;
            const pos = this.getDecimalForPixel(pixel) / offsets.factor - offsets.end;
            return this.min + pos * (this.max - this.min);
        }
        _getLabelSize(label) {
            const ticksOpts = this.options.ticks;
            const tickLabelWidth = this.ctx.measureText(label).width;
            const angle = toRadians(this.isHorizontal() ? ticksOpts.maxRotation : ticksOpts.minRotation);
            const cosRotation = Math.cos(angle);
            const sinRotation = Math.sin(angle);
            const tickFontSize = this._resolveTickFontOptions(0).size;
            return {
                w: (tickLabelWidth * cosRotation) + (tickFontSize * sinRotation),
                h: (tickLabelWidth * sinRotation) + (tickFontSize * cosRotation)
            };
        }
        _getLabelCapacity(exampleTime) {
            const timeOpts = this.options.time;
            const displayFormats = timeOpts.displayFormats;
            const format = displayFormats[timeOpts.unit] || displayFormats.millisecond;
            const exampleLabel = this._tickFormatFunction(exampleTime, 0, ticksFromTimestamps(this, [exampleTime], this._majorUnit), format);
            const size = this._getLabelSize(exampleLabel);
            const capacity = Math.floor(this.isHorizontal() ? this.width / size.w : this.height / size.h) - 1;
            return capacity > 0 ? capacity : 1;
        }
        getDataTimestamps() {
            let timestamps = this._cache.data || [];
            let i, ilen;
            if (timestamps.length) {
                return timestamps;
            }
            const metas = this.getMatchingVisibleMetas();
            if (this._normalized && metas.length) {
                return (this._cache.data = metas[0].controller.getAllParsedValues(this));
            }
            for (i = 0, ilen = metas.length; i < ilen; ++i) {
                timestamps = timestamps.concat(metas[i].controller.getAllParsedValues(this));
            }
            return (this._cache.data = this.normalize(timestamps));
        }
        getLabelTimestamps() {
            const timestamps = this._cache.labels || [];
            let i, ilen;
            if (timestamps.length) {
                return timestamps;
            }
            const labels = this.getLabels();
            for (i = 0, ilen = labels.length; i < ilen; ++i) {
                timestamps.push(parse(this, labels[i]));
            }
            return (this._cache.labels = this._normalized ? timestamps : this.normalize(timestamps));
        }
        normalize(values) {
            return _arrayUnique(values.sort(sorter));
        }
    }
    TimeScale.id = 'time';
    TimeScale.defaults = {
        bounds: 'data',
        adapters: {},
        time: {
            parser: false,
            unit: false,
            round: false,
            isoWeekday: false,
            minUnit: 'millisecond',
            displayFormats: {}
        },
        ticks: {
            source: 'auto',
            major: {
                enabled: false
            }
        }
    };

    function interpolate(table, val, reverse) {
        let lo = 0;
        let hi = table.length - 1;
        let prevSource, nextSource, prevTarget, nextTarget;
        if (reverse) {
            if (val >= table[lo].pos && val <= table[hi].pos) {
                ({lo, hi} = _lookupByKey(table, 'pos', val));
            }
            ({pos: prevSource, time: prevTarget} = table[lo]);
            ({pos: nextSource, time: nextTarget} = table[hi]);
        } else {
            if (val >= table[lo].time && val <= table[hi].time) {
                ({lo, hi} = _lookupByKey(table, 'time', val));
            }
            ({time: prevSource, pos: prevTarget} = table[lo]);
            ({time: nextSource, pos: nextTarget} = table[hi]);
        }
        const span = nextSource - prevSource;
        return span ? prevTarget + (nextTarget - prevTarget) * (val - prevSource) / span : prevTarget;
    }
    class TimeSeriesScale extends TimeScale {
        constructor(props) {
            super(props);
            this._table = [];
            this._minPos = undefined;
            this._tableRange = undefined;
        }
        initOffsets() {
            const timestamps = this._getTimestampsForTable();
            const table = this._table = this.buildLookupTable(timestamps);
            this._minPos = interpolate(table, this.min);
            this._tableRange = interpolate(table, this.max) - this._minPos;
            super.initOffsets(timestamps);
        }
        buildLookupTable(timestamps) {
            const {min, max} = this;
            const items = [];
            const table = [];
            let i, ilen, prev, curr, next;
            for (i = 0, ilen = timestamps.length; i < ilen; ++i) {
                curr = timestamps[i];
                if (curr >= min && curr <= max) {
                    items.push(curr);
                }
            }
            if (items.length < 2) {
                return [
                    {time: min, pos: 0},
                    {time: max, pos: 1}
                ];
            }
            for (i = 0, ilen = items.length; i < ilen; ++i) {
                next = items[i + 1];
                prev = items[i - 1];
                curr = items[i];
                if (Math.round((next + prev) / 2) !== curr) {
                    table.push({time: curr, pos: i / (ilen - 1)});
                }
            }
            return table;
        }
        _getTimestampsForTable() {
            let timestamps = this._cache.all || [];
            if (timestamps.length) {
                return timestamps;
            }
            const data = this.getDataTimestamps();
            const label = this.getLabelTimestamps();
            if (data.length && label.length) {
                timestamps = this.normalize(data.concat(label));
            } else {
                timestamps = data.length ? data : label;
            }
            timestamps = this._cache.all = timestamps;
            return timestamps;
        }
        getDecimalForValue(value) {
            return (interpolate(this._table, value) - this._minPos) / this._tableRange;
        }
        getValueForPixel(pixel) {
            const offsets = this._offsets;
            const decimal = this.getDecimalForPixel(pixel) / offsets.factor - offsets.end;
            return interpolate(this._table, decimal * this._tableRange + this._minPos, true);
        }
    }
    TimeSeriesScale.id = 'timeseries';
    TimeSeriesScale.defaults = TimeScale.defaults;

    var scales = /*#__PURE__*/Object.freeze({
        __proto__: null,
        CategoryScale: CategoryScale,
        LinearScale: LinearScale,
        LogarithmicScale: LogarithmicScale,
        RadialLinearScale: RadialLinearScale,
        TimeScale: TimeScale,
        TimeSeriesScale: TimeSeriesScale
    });

    Chart.register(controllers, scales, elements, plugins);
    Chart.helpers = {...helpers};
    Chart._adapters = _adapters;
    Chart.Animation = Animation;
    Chart.Animations = Animations;
    Chart.animator = animator;
    Chart.controllers = registry.controllers.items;
    Chart.DatasetController = DatasetController;
    Chart.Element = Element;
    Chart.elements = elements;
    Chart.Interaction = Interaction;
    Chart.layouts = layouts;
    Chart.platforms = platforms;
    Chart.Scale = Scale;
    Chart.Ticks = Ticks;
    Object.assign(Chart, controllers, scales, elements, plugins, platforms);
    Chart.Chart = Chart;
    if (typeof window !== 'undefined') {
        window.Chart = Chart;
    }

    return Chart;

}));